Power windows for A-bodies

I just installed the 4 window kit in my 70 dart. The fronts went smooth and seam to go up and down smoothly. I haven't tried it with glass yet, as I have to have the vinyl top installed, and it wraps around were the rubber seal goes. The rears are a bit of a problem. I cant seam to get them from binding when moving up and down. It pinches hard, it flexes the whole inner structure. I have spent a couple days on just the rears, finally pulled the whole unit out and laid on top of the original mechanism. They look really close. I talked with XV and I think I will pull everything and send it back to them, as my car is going to the upholster tomorrow. It should be gone for 4 - 5 weeks, so hopefully they can figure it out by then. I think I am the first A body to install them. I have got a few other things from XV and they have been great to deal with, I am sure they will resolve the fitting issue.