Ok, here is what I found. I checked the number on the radiator in my parts manual for the 68’s... the number indicates it is for either a 68 Belvedere or a 68 Coronet, for their 440 engine. So in looking for hoses at Rockauto, they do have a Dayco hose that looks correct for my application.... so, until I find myself the correct radiator, I am purchasing the Coronet upper hose. Thanks for the help, all!