I doubt you'll find a GMC radiator at Chevy Duty. But a radiator shop can install an internal cooler.
If you already have an external cooler I don't think the internal will help cool though. It will warm it to operating temp quicker in cold weather.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.