I think they are out of print. The Mopar parts sellers have them listed but none in stock. The one I quoted from was 1966-68. THe parts interchange books are a must have. You can find used ones for sale at swap meets. Ah, your lucky day, Mega Parts has the one you need. Chrysler Corporation Production Option Code Book 1966-68, Production # Books, 147-GGB104 Reproduction, NOS and Used Mopar Muscle Car Parts
