Quote from amxlonnie on 10/16/11 at 11:16:07:I beleive those hole held caged nuts to bolt the radiator in. the "cage" part keeps the nuts from turning when the bolt is installed. as cars get older and taken apart a few times and rust, the cages let go and fall off, then usually get replaced with regular nuts and washers.
My radiator has always been held in with the same four bolts. You can see one to the right of the cage nut holes. Would they be the same type of cage nuts that hold the battery tray in? I've relocated my battery to the trunk and don't need them any more. Could be a neat way to 'recycle' those parts.