AFAIK only two Fender 2x12 tweed combo amps were ever standard in their lineup. The Twin and the Super. BUT... That doesn't mean there was never a 2x12 5F6A that left the Fullerton plant as it was made there. There are still occasional reports of odd ball amps that Fender made only a couple of or even just one. But I don't know of any standard Fender amp that was a 2X12 combo with a 5F6A circuit. That absolutely shouldn't stop you from building one.
EDIT: It occurs to me that the 5F6A requires a 2 ohm load. Fender only used 8 ohm 12's. So without a change of output transformer there would be an impedance mismatch. Any amp with a different OT wouldn't be a 5F6A. Fender would have changed the designation.