Had the same problem a loooong time ago and I couldn't seem to get the rubber grommet (on the brake pedal arm above the pedal... At the brake switch). May be available now?
Mine broke and I tried to glue it back on. That did not work, because of the type of rubber. Instead, I found 1 or 2 pennies on my floor (while upside down in the driver's seat) and glued them together, onto the spot where the rubber grommet went. I think I was using Elmer's gue. Worked perfect after that.
Good luck.