1967 vent windows

[jlb307]

Been going a little cuckoo trying to find out for sure, but everywhere I look and everyone I talk to I get a different answer.

I'm trying to restore the vent window assemblies to my '67 rather than get repos.
I'm stuck on how to do it because I'm not sure of the materials.
Which parts are polished stainless, and which parts are chromed steel?
The only thing I know for sure is that the actual frame attached to the glass is chromed potmetal.
I've attached a pic for clarity.

ANY help anyone can give would be GREATLY appreciated!