Vin numbers

IIRC

In 68 like 67 the core support and trunk lip still had the SO number not the serial number from the vin.

The SO number is only on the build sheet and IBM card and fender tag, and the vin is on the build sheet and IBM card so with out either there is no way to tie the car's vin to the SO number.

In 69 I believe the vin was used.