Umm, they may make 2 different radiators. The only difference being the one for the automatic has a resevoir made in the outlet tank with 2 fittings, one for tranny fluid in and the other out, it uses the "cooler" coolant before it goes back into the engine to cool the tranny fluid. If you have a standard all you have to do is not use the fittings, if you don't put fluid in the resevoir, it remains empty therefore eliminating the need to plug it. This does not affect the cooling or anything else at all.
A lot of companies actually only make one "universal" radiator, and this is the reason why.
Know your sh*t before you call people stoopid, I know mine.