I’ve got a clear lid coolant reservoir that came out of my 70 Skylark. It never leaked on me, but it’s got some light cracking in the plastic and the previous owner looks to have sealed the top with some rtv. I replaced it and don’t need it anymore. If it can help you out, you pay the shipping. Don’t have the cap for it.
I have a buddy looking for one of those. I'll spring for shipping and try and clean it up Actually let me pass he said he has a usable incorrect one now. That will give someone who has no overflow tank at all a chance to save some money but thank you. Very kind of you : )