I am looking for the NOS stainless for them. Do have some glass, but will have to check and see how many. They are very common, but not when I am looking for a part.
Originally they were indeed glass, but it was untempered and they were all replaced with plastic in the mid to late 80s. At least that's when they were replaced at the Mobil I worked at as a kid. I know because I shoved my arm through one in 1987, and after that they were all switched out with the plastic ones. It's too bad, too, really, because the glass looked sharp.... er, uh, I mean it looked good. ;-) The plastic hazed up pretty easily.