I'm not sure of the '68, but I just installed the trim and glass on my '67 GP. On the'67 the door skins, both inside and out, are the same for the cars with or without vent windows ( Cat, Bonny, and GP). There are sets of holes for mounting either window track set and of course the vent frame. It is actually a good case of GM engineering, by using the same door it reduces the need to press two different sets of doors, instead just set up the tooling to press out all the holes you might need either way.
Hope this helps,
-harry
1967 Grand Prix Convertible Project
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Sold - 1967 Grand Prix Convertible ( http://forums.performanceyears.com/f...d.php?t=639110 )
2003 Bonneville coupe (hers)
2007 Avalanche LTZ 4x4
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