Father-Son 1974 Duster Project

So I have an aftermarket radiator and the holes for the fan shroud line up perfectly. My car was radiator-less when I got it so I don’t have the hardware for the shroud. But it looks and feels like some short self threading 1/4-20s will do the trick without trying to get some small tin nuts to work. Not self drilling but self threading. The bolt will safely pass outside of the frame of the radiator.