I got the reducer from Summitt Racing.
I had to trim it down with my pipe cutter.
Hmm, new hose looks a bit different, but has the same number. Guess the old hose was tweaked into position.
Using the old hose as a template, looking good.
Just need to find a 1-13/16" hose to join the reducer to the outlet.
I have the same problem with the heater hoses, 3/4" at the waterpump to 1/2" at the heater.