Re: Rubber double seal for truck cab:
Rather than buy the by-the-foot stuff as sold very dearly here in the States I went prospecting in a scrap yard. I found a bulb type seal that had the same form as a sample of the original and bought two doors' worth of that from a minivan (Dodge Caravan - awful things, but useful for parts).
Installed this using 3M double-sided trim tape and it looks and works great and installation was a doddle. Sure beat hell out of weatherstrip adhesive or rivets - much cleaner and faster.