[Build-It-Break-it]

What I've done in the past is take a wire coat hanger or tig rod and bent it to the shape of the hose I needed. Then measure the radiator neck and thermostat neck for correct openings. Take the coat hanger to the auto parts store and find the correct hose.

They'll usually let you go back there and search. Once you find the hose keep the wrapper on file for next time. I've always found the hose I was looking for.

Also a side note, some of the exact same auto parts stores carry more selection then others so find the bigger busier stores and go there. Hope you find it.