My 11/71 build date 1972 d100 came with a 26" opening. Weird.

I used an aluminum radiator from a place called "the radiator lady" who is in lake Elsinore out here by me. I think she deals with champion.

When I ordered the radiator for my 74 440 w200, they showed a 22". But it's a 26" truck. I ended up having them weld on a U channel on a 26" core. Works great, and has threaded holes to accept electric fans front and rear.

I did have to trim 1/8" off the passenger side core support/radiator opening.

I've got 2000 miles on the setup so far. About 500 miles of granny low/4low hill climbing. She never gets above 185* even if left idling for an hour.