That's a pretty common radiator and can be found in 72-86 model cars and trucks. Rockauto has new for around $110. You can probably get one at the local parts store for about the same price. keep the cooling in the radiator and add an external cooler (cheap insurance) if you are worried about the tranny getting hot.

1953 Chevrolet 3600
Fried Green T'mater (Vern)
In the Stovebolt Gallery
Caution: Political Statement
Man who runs in front of car gets tired, man who runs behind car gets exhausted.