I purchased the door seal for my 76 MH from Ace Fogdall in Iowa.
It came with a adhesive foam tape pre-applied. I pulled the old stuff off of the door and using a dremel tool with a sanding wheel stripped the old glue off and got to clean alum. Then it was just peel and stick. I put it on 5 months ago and have not had any problems with adhesion.
They sell it by the foot, so measure and get enough to make a mistake. Florence or Christy can help you and they are at 800-747-0747.
They also have the insert for the interior trim in the bathroom, kitchen and lounge if you need it. It was originally ivory in color, but tends to fade to a tan/brown color.
WBCCI #5501 AIR # 49
1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato