Someone gave me an old Gemtop camper shell for my Ford Ranger XLT. The problem is the profile of shell and cab is not the same with probably a 1-11/2 inch gap between. This is not anything more than a work truck but I would like to keep the rain out if I'm carrying tools. Any of you have any solutions short of $100 worth of rubber gasket online? Thanks in advance for any help! There is no front in this shell -just the edge of the sides and top to attach to.