13310-A2B-000 Rings, Piston (50cc std, 40mm) 13310-A2C4-000 Rings, Piston (90cc std, 50mm) 13310-A2D-000 Rings, Piston (90cc std, 52mm) 13310-A2D-525 Rings, Piston (+0.5, 52.5mm) 13310-A2DL-000 Rings, Piston (100cc std, 53mm)
