As long as the physical measurements are the same and it fits, you can use it, just plug the trans. Oil cooler lines, since they are not used in the manual trans. They should be identical (upper and lower coolant hoses) except for oil cooler lines.
Most aftermarket replacements would come with oil cooler lines, wheather manual or auto. GM makes two different radiators, one manual (no cooler) and one automatic (cooler).
You COULD NOT use a GM manual radiator in an automatic.
Friday, December 1st, 2017 AT 3:49 PM