Originally Posted by Mr. Canoehead
I had a vinyl (pleather) Russell with the same issue. I compared it to a stock seat that I had laying around and the part number on the pan was the same. I would think that BMW would change the part number if the pan shape changed. Maybe you should compare the part numbers on your RM to the one on your stock seat.
I never did figure out why one seat had a bigger gap than the other but the pleather on my seat in perfect shape and I doubt it was strong enough to bend the pan - I could barely bend it with my hands.
I was looking at the mold date stamps on a seat pan from a 2000 1150 I was repairing and it appears BMW have been using the same mold since 1993 - which means you will probably see the same thing on yours