I have five FC wheels, which shows 67-69 Camaro in my Colvin's By the Numbers book. The CRG data shows the FC wheels to have date codes on the lip instead of by the valve stem, but four of my wheels are dated around the valve stem like "K-1-8, 5, valve stem, 7, FC. I'm trying to put together a set for my 68, but not sure what was correct. Any help out there?