Steering Sector Shaft Retainer for Farmall 140, 130, 100, SA and A Tractors, 43500D Front axle stop retainer is

Front axle stop retainer is also used on tractors equipped with heavy duty adjustable front axles and some hi-clear tractor models

Kubota B6100HST with Hydrostatic Transmission and 4 Wheel Drive

and  High Crop 140 Tractors

401 - INTERNATIONAL HARVESTER FERTILIZER UNIT (1/58-12/64)

Right in the IH Plow Bottoms Parts Catalog

Steering Sector Shaft Retainer for Farmall 140, 130, 100, SA and A Tractors, 43500D Front axle stop retainer isSteering Sector Shaft Retainer for IH Farmall and International A, AV, Super A, Super A 1, Super AV, Super AV 1, 100, 130, and 140 Tractors. Case IH Steering Sector Shaft Retainer part numbers 43500D. ALL Farmall Tractor Steering related parts