As far as I know - in 68 both FB and GTO with RA used the same 19” 4 blade fan. Did not matter if auto or 4sp. Mine has a 4 blade and there was a 4 blade in the truck of my RA FB when I got it.
There was a 7 blade clutch fan option listed in 68. (#514)
Where is muscle_collector!! You have a bunch of 68 RA cars, what fan is on them?
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