Body Plate Codes - 1964 through 1967

Things we don't know - if you do, please enlighten us.

Codes listed are garnered from knowledgeable folks on ChevelleStuff Forums & the Chevelle Mailing List and will be updated as information becomes available. If you have any codes to donate to this cause (or find any here that are incorrect), please contact me specifying the model year, group number and letter designation. It's reported that some plants used different option code letters for the same option. Also, only Atlanta, Flint, Framingham, Kansas City, and Van Nuys used these codes on the body plate; Baltimore and Fremont did not.

Codes are listed by Group and apply to all GM Fisher Body cars, not just Chevelles. Hence, you'll see option codes for "rally sport," "Z-28," etc. that do not apply to the Chevelle lineup or apply only in part such as the "Turbo 400." I'm currently removing items not known to be Chevelle options.

Note: n/a indicated the information is 'not available' or 'not applicable'; tbd indicates the information is reported but specifics are not known or is unconfirmed but is 'to be determined'. Some codes are reported from Chevy COWL TAGS, by Mark Allen and these codes are for everything in the Chevrolet lineup so they may or may not be applicable to the Chevelle series. These are noted by "(questionable concerning Chevelles)".

Group 1
Code	RPO	Year(s)	Description
B	tbd	1967	unconfirmed
D	C06	1965-67	power top
E	A01	1964-67	tinted glass - all
F	A41	1964-67	4-way power seat
G	A33	1964-67	power tail gate - station wagon
K	tbd	tbd	split second seat - station wagon (unconfirmed)
N	tbd	tbd	roof rail lamps (unconfirmed)
O	950	1965-67	two tone paint
T	A46	1965-67	power bucket seat (confirmed for 1965 & 1966 under RPO A46 but no such RPO is reported by Chevrolet for 1967)
V	tbd	tbd	station wagon roof rack (unconfirmed)
W	A02	1964-67	tinted windshield only
X	A31	1965-67	power windows
Y	tbd	1965-66	unconfirmed

Group 2
Code	RPO	Year(s)	Description
A	tbd	1965	foam bench seat cushion, HD seats
A	tbd	1967	Unknown - Found on 1967 Atlanta and 1967 Kansas City body plates as well as 1967 Baltimore trim sheets
B	M13	1966-67	3-speed, floor shift (standard on SS396)
E	C60	1966-1967	air conditioning **
G	D55	1964-1967	console
H	C48	1966-67	heater delete
K	C60	1965-67	air conditioning **
L	M20	1964-67	Muncie & Saginaw 4-speed
M	M35	1964-67	Powerglide
N	U79	1965-	N ~ AM/FM Stereo Multiplex
O	M10	1966-67	3-speed w/Overdrive
P	Z01	1964-65	comfort & convenience group, Type B (300 & 300 Deluxe) comfort & convenience group, Type A (Malibu) (inside day/night mirror, driver side outside mirror, 2-speed wipers, washer, back-up lights, glove box lamp, and bottle w/s washer fluid)
Q	M21	1966-67	4-speed transmission [RPO M21] *
R	U80	1964-67	radio speaker, rear
S	U73	1964-67	rear antenna
T	U75	1966	rear mounted antenna, power
U	U57	1967	stereo tape system
Y	???	64-65	possibly 2-tone paint in 1964 - found on several 2-tone paint Kansas City tags
Z	M40	1967	Turbo Hydra-Matic 400
			* There is great debate about what the "Q" code meant 1966 & 1967. I have data on at least 19 1966 & 1967 trim tags from Atlanta, Flint, and Kansas City with this code where no other transmission code is shown. It's found on bucket seat cars, bench seat cars, SS396 series, Malibu series, and even one base 13480 El Camino so it's not unique to a seat type or series. The question is why would Fisher Body put a "Q" on a trim tag for an M21 when, as far as Fisher Body was concerned, a 4-speed should be a 4-speed as far as any floor pan modifications would be concerned? The "Q" is used along side of the more typical "L" which is generally accepted to be a 4-speed (be it M20, M21, or M22) and, of course, there are "L" coded trim tags in the same time frames as "Q" coded ones found. It's found on bucket seat cars, bench seat cars, SS396 series, Malibu series, and even one base 13480 El Camino so it's not unique to a seat type or series. It's found in the same body build time frames as "L" coded tags so it's not an early vs. late thing either. Update November 20, 2011: A July 1967 built L78 from Kansas City has been found with the letter "L" in the second option group with a good amount of paperwork showing the car is an L78 car with an M21 4-speed transmission. An interesting twist in the hunt for the true meaning of the "Q" or was this a very late model change back to "L," an error by Fisher Body, or just what. The saga continues... ** Both "E" and "K" have been found in group 2. The "E" has been found on Atlanta & Kansas City trim tags as well as Baltimore trim sheets while "K" has been found on at least one Framingham tag. The letter "K" has not appeared on any Atlanta or Kansas City tag and the letter "E" has not appeared on any Framingham tag to date
Group 3
Code	RPO	Year(s)	Description
B	C50	1964-67	rear window defogger
C	B70	1964-65	padded dash
D	Z01	1964-67	special lighting group
F	Z13	1965	outside remote mirror
X	tbd	1967-	unknown
Z	J65	1964-65	metallic brakes

Group 4
Code	RPO	Year(s)	Description
D	C50	1967	rear window defogger
F	Z13 Z19	1964-65 1966 1967	Believed to include driver side outside mirror in comfort & convenience group (See group 2 code P, RPO Z01) comfort & convenience group, Type B (300 & 300 Deluxe) ⁽¹⁾ comfort & convenience group, Type A (Malibu) ⁽²⁾ Unknown, Possibly auxiliary lighting group
F	Z13	1964	driver side outside mirror
H	?	1967	unknown (seen on 1967 Baltimore trim sheet)
M	Z16	1965	SS 396/375
P	?	1965	unknown (seen on very early 1965 KC tags); also seen on Framingham tags throughout the year.
U	?	1965	unknown
X	?	1967	unknown (seen on 1967 Atlanta)

Group 5
Code	RPO	Year(s)	Description
B	V30	1967	front bumper guards (questionable concerning1967 Chevelles)
C	?	1965/1967	unknown - 1965 found on Kansas City tag
G	?	1964-1966	unknown - found on Fisher Body buy out paperwork along with "Y" which is for custom deluxe seat belts.
H	?	1967	unknown - found on Framingham tag
J	?	1967	unknown - found on Framingham tag
L	?	1965-66	unknown - found on Framingham tags
M	?	1967	seat belts, rear
O	?	1964-67	exterior chrome (seen on 64 and 65 tags only but may appear on other years). Other sources indicate this may represent a seat belt delete code.
T	?	1967	unknown
V	A37	1964-	seat belts
W	A49	1964-65	seat belts, custom deluxe (with retractors)
Y	A47 A39	1964-65 1966-67	seat belts, custom deluxe
Z	A85	1966-67	shoulder seat belts

* Uncertain on F code in group 4 for 1964 & 1965 as there is already a known P code in group 2 for Comfort & Convenience Group.

⁽¹⁾ Back lamps, outside rear view mirror, two speed w/s wiper, washer bottle.
⁽²⁾ Inside day/night mirror, remote outside rear view mirror, door guards, luggage/glove box/underhood lamp.

Things we DON'T know

Why didn't Baltimore or Fremont use group codes?
Why are there five groups and not three or four or six or nine?
Why isn't group #1 numbered?
Who decided there were to be groups?
Who decided there were to be five groups?
Who decided to stop using groups after 1967?
Who decided what letters to use for a particular option in each group?
Who decided what options were to be in each group?