Back glass on a 71 SportsRoof can be tricky. It tends to do two things extremely well: One is leak and the other is bleach out the back seat and the package tray. Too often, weve seen these skylights with cracked weatherstrips that lead to warped package trays or rotted floors in the trunk.
Now were not saying the Ford install will work any better than any other install, but theres a difference, and in some respects, its a major one. If you look at your Ford assembly manuals, youll find that they used closed-cell foam on the metal edge of the back-glass opening. Ford even gives dimensions and placement for the foam. The foam, when used in our install, tightens up the weatherstrip and hopefully makes for a better seal. This process was most likely used on other SportsRoof and fastback models as well.
For our weatherstrip, we turned to our good friends at California Mustang. Some of our other products, such as the closed-cell foam, was purchased at the local hardware store. Note, you may have problems getting the exact width and height foam, but something approximate can be adjusted to work quite well.