I have an F250 short bed that I put a Leer topper (100XQ) on. I bought it used and the seals around the back window were completely gone. Leer dealer wants the better part of a $150 to reseal it. I bought the seal material to do the job but am not quite sure how they are positioned. I was hoping someone out there has a 100XQ and could post some close up pics of the back window seals.