The seal will ONLY fit newer model tractors which has now standard 1-3/8" inch PTO shafts
Oliver part number 5LT4031
Replaces Case IH hydraulic Extension Arm part number 650312R1
The mounting holes are 7-1/4" inches apart (center of hole to center of hole)
It will have surface rust and normal wear from age
New Old Stock Water Pump Impeller for Oliver Tractors, 1K351 The seal will ONLY fitNew Old Stock Water Pump Impeller for Oliver 66, Super 66, 660, 77, Super 77, 770, 880, 88, Super 88, and Super 55 Tractors. Oliver part number 1K 351, 1K351. Part is still in original Oliver packaging.