spurs fan2

Ok so I'm pretty new to the rotary and rx7 in whole and my radiator is leaking up bad from the top cap and in that area and is rusted inside was just curious should I buy a new cap or just replace radiator as while just to be safe I've been recomended koyo radiators for it and I planned on getting a manual trans radiator and then buying a universal cooler off ebay would that work and I could just find fittings and hoses from local parts store that hook up to hose barb? Is there any dif in radiator hoses between at and Mt radiators??