Anyone know where I can find a radiator overflow tank metal screw on cap. Everything I found online are the plastic snap on caps.

 

That is an aftermarket add-on tank that is long out of production. I doubt you'll find a ready replacement cap, unless there's one from a jar that just happens to fit. No 1969 Olds came with an overflow tank from the factory.

 

I didn't know these were not included from the factory. Thanks for the feedback!

 

Perhaps it is possible to clean that one up (chemically, maybe?) and plate or paint it.

 

Caswell Plating.

 

I believe I've seen lids nearly the same in WalMart & assorted places which have a Home Furnishings/Cooking/Cookware department. Sold individually. Here's a representative picture of them (I know you don't need 40 of them).

 

So, in all seriousness, what's the intent here? If this is a concourse restoration, the tank needs to be completely removed since it isn't factory anyway. If the goal is just to have an overflow tank that doesn't look crappy, buy a new generic one and swap it out. That's likely cheaper and easier than trying to find a matching cap.

 

Just looking to clean up the engine bay. I will buy another aftermarket tank and bracket.

 

I think I have one of those.