Overflow cap missing
 

Changed the oil and filter in the '79 today......noticed that the cap for the 'radiator overflow tank" is missing. Just flat out disappeared!
Any ideas where I might come up with one of them?

Depends on how correct you want to be. The vendors here carry the non vented, official worded (blue,white, and black label), for @$13 or you can go to the local auto parts store and get a replacement vented one (black plastic with raised white letters) off the rack for @ $3.

I think the O.P. means the cap on the Rad overflow tank. Not washer fluid rez.

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Thanks, deleted