Ted, I suggest you watch ebay auctions for these bits. You can use either 76 or 77 parts. It takes a bit of time sometimes to locate them.
Canadian tire sells a lens repair kit that you might use in the meantime. My LeMans is a one year only parking lamp and I ran these repair lenses for a good year or two before I was able to get good ones.
Ironically I got them from a member on here three years ago before this site even existed. He outbid me on an Ebay auction for NOS, so I contacted him by ebay's mail system. Turned out he had several that were fine for driver which is what I needed.
Thanks 73SC!! Would other makes' parking lights fit such as Chevelle / El Camino of the same years?? On the Canadian Tire kit, do they sell the plastic lens and one would have to trim to size or is it just a plastic glue kit?? I appreciate the response.. Ted
I don't think any other A body lens will work but of course I won't say never, a lot of things can be made to work until you find what you need.
At Canadian Tire the repair kits are a thin plastic sheet that is trimmed to size and shape, mine lasted two years until I removed them from the car, still would work if I needed them. The also have a lot of amber and clear lenses there for trailer and truck lights. I am sure you could make up something suitable that was inexpensive for the time being.
I've bought parts from Prairie Camino, he is in Canada so shipping cost is not an issue: