Vent Window Questions

[twoskies]

Hello

rebuilding my vent windows on my 1972 c10, i have the rubber piece that goes on the outside of the window ,
on the window frame itself (where the glass sets), is there supposed a rubber seal or does it just pinch into the metal frame, also the front window track which is part of the vent window, where do i buy the seal and whats it called,
it has a fabric feel to it

ill try to upload pictures tomorrow if needed

Thanks for any help