It would be the pressure side fitting on the pump...Maybe still available from GM? ANY pre-'81 pump has what your looking for, doesn't have to be a Chevy, truck, 350 or anything like that...a '72 Buick pump, a '77 Toranado, a '79 Chevy van, ect. ect. ect. Salvage yard trip? Now if your trying to get a chrome one or something, now your on your own. Hope this helps, Lorne