Nope, but I bought a new Muncie trans with 3/8" bolts around 1970 and from around then and after they all had that type.
Older were 5/16" studs and I think some had 5/16" bolts. The slots were smaller on the shifter arms too.
I bought a Hurst Shifter for my 67 and had to change the shifter arms to larger slots to fit the 3/8" bolt cover, so 67 must have had the 5/16" size.
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