Hi Rasman, I work in the glass trade,although I personally haven't fitted trims to the Tri-Chevy pick-up I would imagine the trim is fitted along with the rubber and then fitted as a complete assembly.
Maybe fellow 'Bolter' wilbur is watching and could join in with some of his wisdom! grin Alternatively go to the members list and contact him directly.
I'm quite sure he could point you in the right direction!
Hope this helps
Jock thumbs_up

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.