I was going through some of the boxes and came across a bell housing with a shift fork still in it. It is the correct bellhousing number, with some Buick red paint around the inner edge. However, I had written on the box "Olds 442 parts". This looks like a BBB fork? The lower one/ dirty one is the original to my 70 GS.... Thoughts?
While technically not a shift fork, we understand what you are saying about the clutch fork (yoke). The BBB yoke was specific to Buicks only. The small block fork however was also used on Olds and Pontiacs. The Corvette one is somewhat close... https://www.4speedconversions.com/3887177-1.html
I do have some customized ones that are close. Designed from a Factory Clutch Fork with a Jig so they're all consistent . . . . . I don't know of anyone else making these (And due to the small demand nobody probably will) I have a bunch of 4 speed stuff in the works. See my Manual Trans Page for more information