Not sure if I can explain this correctly, but how tightly should the back of the top fit on the tonneau cover? I do believe there is an adjustment, and I have rain coming in between the top and the tonneau...should I try to adjust it so it fits tighter?

 

Wow, never heard of a leak THERE. The adjustment would have to be with the mechanism on the bottom of the tonneau cover, didn't think it was adjustable.
Could it be the gasket on the bottom of the bow????

TIme for bed....

 

Have no clue...I can get a look tomorrow...is there supposed to be some kind of gasket, I wonder?

 

There should be a rubber seal around the bottom edge of the back portion of the top where it contacts the tonneau cover. Yours may be missing if you have a leak. Mine latches tight enough to where it squishes down on the seal very tightly. If the seal is there you may want to check that latch out, might have a damaged mechanism.

 

I would suspect that the mechanism is not damaged, as the top works as it should. I could be wrong. I will be looking at the seal tomorrow. I see by the parts list there are two seals, one for cars made prior to January of '05, and one for cars produced after January 14, '05...