i was wondering if theres a way to clean up the lens to make them look newer just cleaning them gets them clean but then they dull out any suggestion thanks brian.

Have them polished by a detail shop. With proper buffing and compunds, they will come out like new. I found a NOS one for my car so I bought it. The other side I had but was the original one in perect condition other than being faded. I took the original one to the detail shop and they polished it out. I compared the two (NOS and original after polishing) and you could not tell the difference. Not in the daylight nor at night with the lights on. Trust me. Mike

Buffing worked for me as well.

thanks ill try the buffing

67 beaumont back up lenses are the same as 65 and 67 chevelle.  I think you can buy them new for about 10 bucks each.  Why waste time polishing, unless you want originals.