>> Various letters are found on the third line of the trim tag. These include:

>> B or W: Reported to indicate the color of optional D88 hood and deck stripes.

>> L: Probably the most controversial is the letter L found on Malibu series Chevelles. It's strongly believed this letter L indicates external SS Equipment trim but this has NOT been confirmed by any direct knowledge or GM documentation. While using this letter as a way to determine if your 1972 Chevelle is a true SS or not is up to you, there is no 100% guarantee but there is strong evidence that it does.

>> Z: Found on base 133/134xx Chevelles. It's believed it has to do with base Chevelle exterior trim but that's not confirmed.