I only know '68 B-body cars and only know that the last numbers stamped on the radiator support and the trunk drip rail were NOT the last numbers of the VIN but the numbers from the lower right of the FENDER TAG. If the car still has a fender tag, broadcast sheet or original Monroney label/ window sticker I think all of those have that (sales order?) number? Again that's how the '68 B-bodies were done.
MikeR
(The last of the VIN were on '69+ cars)
Yes,it is the sales order number.
I have a C body and the trunk lip number matches the sales order number on the broadcast sheet and fender tag.
This can be confusing especially to not well informed Customs Officials when a 68-older car is crossing the US/Canadian border,for example.
