I'm putting a new gas tank, straps and rubber insulating strips in a friend's '69 Camaro. The rubber strips that go on the straps are longer than the narrow part of the strap and not wide enough to go over the wide part of the strap (does any of that make sence?). My question is, am I suppose to cut the rubber off as short as the narrow part of the strap or leave it long and put up with the bad fit? Also, there is a rectangle piece of foam rubber, about 3 inches by 6 inches and 3/8 inch thick, with the insulating strips. Where is this suppose to go?