So now your windshield sits closer to the frame due to the thickness difference between the butle (sp) rope and the urethane. I don't think you can fix this other than resetting your windshield. If you found a solution let us know. This just confirmed my plan to use the stock butle rope when I re-install my windshield.
Good luck
Honest dad, that 455 on the side of the block is a serial number