I have one pair on big block exhaust manifolds off of my 69 Corvette. You decide what they may fit. One is 3884504. Non smog. Looks like date is L205. Other manifold is 3969869. Has smog holes but are plugged. Date looks like J225. All holes good. No broken studs. Sold as pair only. Plus shipping. 250 for the pair. E mail is [email protected].