I am in the process of installing a PUI interior kit in my convertible I have covered the rear bottom seat frame with vinyl and am using 1 1/2 inch foam. Along the back of the new cover (3 inches from the back is a rod for hog ringing the cover to the seat frame. There does not seem to be anywhere to hog ring to on the seat frame other than the springs. Does anyone have any advice on where the seat cover should be attached to on the frame?