Vent window questions

[Dale99]

1. I know that the 72's have the screw to help align where the window goes. I see that lmc sells 67-72's, which makes me assume I can get a set from any year, and drill whatever hole and make them work?
2. From my understandings, the main upright, there are chrome versions, and painted versions? Safe to say if its painted on the inside, I had the painted version?
3. As for the metal thats on the glass. One side of mine is chrome, other is rusty. Again, are there chrome and painted versions?
4. Vent windows have to come out to replace the window regulator correct? (wanting to convert door to 67-71 door panels)