why not just cut down the rubber 1 nubs. I think you will be disappointed in the polyurethane. you might as well remove the pad completely, polyurethane is so stiff you will feel like your right on the metal

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)