roof rail weatherstrip isnt fitting well

I am replacing the weatherstrip on my 76 Duster and I bought the stuff from Metro and the door weatherstrip is fitting nice but the roof rail is not fitting like I want in the corner. The number is RR4005 and the man at Metro told me that is the correct one. I thought I read somewhere on here that they had this problem and they done something to fix it. Does anyone have any suggestions. Do I warm up the rubber somehow or what.Thanks
Author: admin