Hi, Bruce
The last two times I pulled a cover, I took the side of a box (such as cerial or cookies) and cut a gasket using non-hardening gasket sealer on both sides. Lay your cover down and draw it out. Cut it out and use a notebook paper hole punch for the bolt holes. This way, you know your have the right one and it won't cost you eight bucks or so. Almost two quarts of dope is right. Get the bottles with the long snout for easy installation.
Truck Tinker