My 1965 C10 had a recovered
1990 Chevy Truck Bench Seat installed by one of the previous owners when I purchased the truck. The seat fit like it was made for it.
Therefore it stands to reason that any Chevy truck bench seat from 1960 to 1998 will fit.
The one in my truck had been simply bolted through the floor and used large oversize washers under the floor.
I still have the seat and some
15x8 truck ralley's that match the recovered seat too.