Details Q&As Description Piston ring set. Standard. Includes 2 rings. For Columbia/HD gas (2 cycle) 1963-95. Fits any 2 or 3 ring piston. Details Description Piston ring set. Standard. Includes 2 rings. For Columbia/HD gas (2 cycle) 1963-95. Fits any 2 or 3 ring piston. Q&As