back window on the coupe has no trim on the bottom and and seal anywhere around it. What's a good book to get stuff like that? I got a box of weahterstripping in the trunk but I dunno if its in there, even if it is I doubt the trim piece is. to hold it in place.
try Ebay, National Parts Depot, or Mustangs Unlimited. I recommend Mustangs Unlimited. Actually, those trim pieces can be obtained from just about any shop which sells restoration parts.