While replacing the oxygen sensor on my 99 LTC as I removed the left foot rest assembly a nut fell from somewhere above the foot rest and landed on the muffler shield. I started looking to see where it came from and I could see a bolt up in the tupperware roughly where my left knee would be. The bolt was not attached to anything and when I touched it with a long stick it fell out also. This is a allen head bolt 10mmx1.5x35mm. A large bolt that must have some purpose! Does anyone know where this bolt might have came from?