This self adhesive door seal gasket is for Airstream main doors from 1974 through at least 1994.
Peel-and-stick adhesive is very strong so position carefully.
The base is 1/2" wide (adhesive is 3/8" wide) and height is approximately 5/8".
Sold by the foot. 20 feet is generally needed to seal one entrance door, but it is a good idea to measure rather than taking our word for it.
It is installed on the door's flange around the primeter with the gasket's profile sloping to the edge of the flange.