The old orig. two piece seals required, that the lip of the frame was bearly inside the seal, and that the glass, was bearly inside the seal on the outside of the truck. I used a little, ok, alot of dishsoap as lub, and gave it good push to get it in place, then I installed the center strip. Wear leather gloves, you'll push that hard. If your seal is one piece, you might have to reduce the over all size of your glass area, have a good glass man grind off the excess, but first, install the seal sans glass and measure, maybe even make a template that fits, you can't attach what you just ground off.
