Ok, upgraded my radiator to a 3-core. I have a small problem in that the monte carlo upper radiator hose is now too small. I have a small block Chevy. 21204 is the gates number for the stock hose. Problem is the upper hose now needs to be 1-1/2" instead of the 1-1/4" hose end. Has anyone ever run into this problem? I know the Be Cool radiators are setup the same. Just looking for a molded hose that fits g-bodies with stock 1-1/2" thermostat housing and the 1-1/2" radiator inlet. Flex hose is a last resort.