Oliver® and White® Series Tractors with Original Bostrom Suspension and the Weight Adjustment Knob Behind the Backrest OR the Weight Adjustment Knob on the Left Side of the Original Seat & Suspension:
Oliver® Tractors: 77, 88, 500, 550, 600, 700, 770, 990, 1250, 1250-A, 1255, 1265, 1270, 1355, 1365, 1370, 1450, 1465, 1470, 1550, 1555, 1600, 1650, 1655, 1750, 1755, 1800, 1850, 1855, 1870, 1900, 1950, 1950T, 1955, 2050, 2150, 2155, 2250, 2255, 2270, 2655, Super 44, Super 55, Super 66, Super 77, Super 88, Super 99
White® Tractors: 100, 125, 145, 160, 170, 195, 2-30, 2-32, 2-35, 2-44, 2-45, 2-50, 2-55, 2-60, 2-65, 2-70, 2-75, 2-85, 2-88, 2-105, 2-110, 2-135, 2-150, 2-155, 2-180, 60 American, 6065, 6085, 6090, 6105, 6124, 6125, 6144, 6145, 6175, 6195, 6215, 6410, 6510, 6710, 6810, 80 American, Field Boss 16, Field Boss 21, Field Boss 31, Field Boss 37