Piston ring set for 3 3/8" overbore pistons.
Four 3/32" rings, eight 1/8" compression rings and four 1/4" oil rings.
Gas tractors with the Z120, Z129 and Z134 engines bored to the 3 3/8" size.
Massey Ferguson: 135, 202, 204, 2135, 2200, 35, 50, Ferguson 40, TO30, TO35
Massey Harris 50