Rebop Castings is still in business making reproduction F code parts. Bonnets, brackets, and blower pulleys are still available. I also have two Thunderbird waterpump spacers left. 75$ plus shipping each. All parts are authentic reproductions of the factory parts, but of a better alloy (nodular iron, not cast ).
I can be reached at firstname.lastname@example.org
or 574 215 0924 during the day Eastern time.
Bristol, In ( by Elkhart)