There are several ways, but I chose to use 90 degree copper sweat-solder fittings available from any hardware store for a couple of bucks apiece. By soaking 1-3/8" Gates Green Stripe radiator hose in hot water for a few minutes, the 1-1/2" OD fittings slide into the 1-3/8" hoses, which then connect to the under-car pipes. On the radiator side, I simply used short sections of 1-1/2" Gates green stripe hose. I just completed a 900 mile round trip to 'Vegas & back with zero radiator problems at all. Other guys use molded 90 degree 1-3/8" hoses and expand the ends for the radiator stub- pipes with hot water. I prefer not to use any molded hoses at all.
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