I have a 70s Ford standard topper / cap on our 75 F-150. & a deluxe one
on blocks in our garden. The seam on the top has separated for about
a foot on the spare. 2 options: Swap out the windows or repair the
split on the roof of the spare. The window gaskets are hard as rocks.
I can cut the rubber. Who sells the replacement widow gasket rubber?
or: How can I repair the foot long separation in the top ?