Just get an Oem type 26 inches. Put one side in with the factory bolts. Put sheet metal screws in the other. Then listen to guys tell you it won’t cool properly because you didn’t cut up the core. Years later, still listen to guys say it won’t cool after you’ve used it for years with no issues.

Or you could get an aluminum 26 inches and do the same thing.

I’ve done that with countless cars, trucks. Big radiator. Get one. Done.