Check out any of the twenty-eight Air Cleaner (model K1/k2/k3/k4) components enlisted.
With four applications this Bolt(6x20.5) is the most specified part.
A sample from the products for the Air Cleaner (model K1/k2/k3/k4) include: Clamp, Tube,breather, Cushion, Screw(6x20).