I have opportunity to buy a used high-rise glasstite topper for a very good price. The problem is that it was on a 99 std cab tacoma. I have an 03 XtraCab. I understand there will be a gap where the topper and the back of the cab meets. How big of a gap should I expect? Anyone have an example of this in picture? The seller is about 2 hours away so I'd rather make up my mind before deciding to drive out there. Thanks.