When i looked up my Polara, i googled a site that gives details on decoding Mopar fender tags. What i recall of the tag, those digits match up to sequence number, meaning the order of the model run produced off that line. The other 6-digit number is order number, meaning the dealer or customer that ordered that particular unit. Does this help? i don't know how to look up which sequence or order number applies, or what it means outside of where it fits in the production line