New aluminum radiator different size inlet port

[astrochimp]

FINALLY getting rid of the original radiator to help with cooling on hot days and save 100 POUNDS in weight. The thermostat housing port is 1 5/16"  and the new aluminum radiator is 1 1/8" inlet port.

There's probably 20 ways to handle this but wondered what would be the best solution? I was thinking get a hose that has the diameter right between the two and make  it work with clamps. 

[MC-71]

What size is the bottom? I would call and complain. Maybe they will just send you the correct one for your application. The answer is always NO unless you ask.