Special waisted bolt for main exhaust clamps (UR5639 and RE25307). Order 2 per clamp.
The mating nut is UR5665, which is a phosphor bronze nut.
Both the nut and bolt for the clamps are special components, and relatively expensive. Although we recommend using the correct nuts and bolts, less expensive steel versions are also available:
UR5666NF-X is a non-waisted steel bolt
UR5665NF-X is a steel nut.