A very old Gates Rubber catalog I have lists as follows: Upper 65-66 Gran Sport w/400 (actually 401) 20466 no A/C 20467 or 20542 (cut at D) A/C Lower no listing GM listing for 65-66 Gran Sport w/400 (actually 401) Upper 1372861 no A/C 1372862 A/C Lower 1372827 You can try NAPA or even Carparts.com to cross reference some of these numbers. Maybe even Autozone.com can cross reference as well. I can't get on wrenchead any more, but got hoses for my 70 from them as well. Good Luck, Mark
A Gates 20704 fits nicely on non-AC applications with a cross-flow radiator. It may need to be trimmed a bit. It's a molded hose, and will look nice! :TU:
