seat spacers

The black plastic hex nut under the front frame rail is just being stored there. It could be move to the top side of the rail like the other two to make the seat slant more. The metal nut on the under side of the seat bracket is what tightens the seat down. the rear seat studs are the same way. The metal nuts in the rear can be difficult to access! they are way up under the cupped seat brackets. Remove the black hex nuts to tighten the metal nuts. then replace them on the studs so they don't get lost!