Kucharik has them; natural chamois is optional. I bought a pair out of retro-contrariness. They made me realize that real progress has been made in this area in the last couple of decades.

I use non-petroleum jelly, a vegetable oil product with the same consistency as vaseline. I use the same stuff as a lubricant for modern shorts.

I might note that if you have surviving shorts from 20 years ago, you might find that they are shorter than modern shorts and look almost as strange as basketball shorts of the same vintage. I own a couple of pairs of old shorts, and they make me marvel at how freakin skinny I was a quarter century ago.