6768 vs 6972 Radiator support Identification
 

Never messed with anything but 71 -72 before but now working on a 1968 step.
I had a few rad supports in stock but never knew how to tell difference between the 2. I think this is an easy way to id. I have checked a few and it seems correct from what I have. Anyone else have different please correct me.

1967-1968 Chevy core suupport has turn signal hole up high

1969-1972 Chevy core support has turn signal wire hole down low

Core support
 

Solver, the 67/68 also has threaded holes for the splash pan along the lower front portion (6 I think). Also, if you look at where the headlights buckets mount, the 69-72 has a raised portion that is spot welded to the core support. There may be others..........