Dear Dan, John, and mid-60s Buick parts hounds,
I thought Fusick made a reproduction. Fusick part # AP64
It has been a long time since I've seen the OEM pedal for my wagon, but given that memory, the Fusick is much closer than the OPGI reproduction. It might be close enough to satisfy Buick Club of America judging.
Thanks Dan for reminding us about this reproduction!
Cheers, Edouard