If I understand this correctly, you have a 55 or later water pump and a 54 or earlier radiator. So, you need a hose with different inner-diameters at each end?
I bought a hose as suggested by Ray, that has the wider/larger diameter (mine had a corrugated outer-body that allowed bending to fit the needed angles). I had a good lower hose with the smaller diameter. I cut the last inch off the smaller hose and was able to put that piece inside the radiator-end of the larger diameter hose. No leaks and a good fit.
