Check it out here:
https://www.eastwood.com/cold-case-70-81-firebird-at-gpf18a.html
1970-1981 Pontiac Firebird Trans Am Aluminum Performance Radiator. Auto Trans Cars. These COLD-CASE radiators are Tig welded 100 percent aluminum and absolutely beautiful. Don't buy a 3 or 4 row aluminum radiator! It doesn't cool as good as these oversize 2 row models.
These radiators are original appearing and have the correct stamping. Once painted, you'd be hard pressed to find a difference over an original versus a COLD-CASE.
Specifications
Core Height:18.4 inchCore Width:27.5 inchOverall Height:18.8 inchOverall Width:33.2 inchOverall Thickness:3 inchUpper Hose:1.57 inchLower Hose:1.57 inchTubes:(2) 1.25 inch TubesTrans Cooler Fitting:5/16" Inverted Flare