I had purchased a set from chevsofthe40s:

https://www.chevsofthe40s.com/detai...Set_2_GM_Script_With_Original_Style.html

The "lower" hose was the right diameter for the upper fittings on both the radiator and thermostat housing, so I cut it into a 90° section and installed it as my upper hose. The "upper" hose in that kit is too small for any of the fittings in my truck.