Hello I recently installed a champion radiator in my scoutII. 1. However, I want to try a different radiator cap (than what it came with) but my old cap off brass stock radiator won't screw onto the aluminum new radiator. Where can I buy caps that will fit the champion radiator? ON a side not my champion radiator cap will screw onto my old brass radiator....... 2. Last night after driving the old girl I parked it in the garage and this morning had a puddle of coolant under the overflow tube on my garage floor. It was a about a quart or less of antifreeze. When I shut it off it was not overheated running at 180 degrees. I did not here any boiling or anything to indicate something was wrong. I have had the thermostat recently stuck open on occasion / causing the vehicle to not warm up. *** SO I am wondering if the thermostat does not close all the way when you shut the vehicle off can the overflow tank fill up with too much antifreeze???? OR is it more likely I need a different radiator cap??? Currently I do not have any other leaks that I am aware of as I did a vacuum test and it held vacuum....... Really getting tired of Cooling issues........ Thanks Guys!!!!!!!!!!!!!