The 18" inch diameter is the original factory standard steering wheel diameter
Planter runner clamp is in good usable condition
The cup is 4-3/4" inches outside diameter at the lip
The last three photos are references showing the type of seed hopper which is needed and how the planter unit mounts
and BN Tractors
Hydraulic Rockshaft Clevis Pin Locking Plate for IH Farmall C, 100, 130, 200, 230, 140, Super A, Super C Tractors, FREE SHIPPING!!! The 18" inch diameter isHydraulic Rockshaft Arm Clevis Pin Lock Plate With FREE SHIPPING for International and IH Farmall Tractors. Locking Plate fits International and IH Farmall C, 100, 130, 200, 230, 140, Super A, F 235, and Super C Tractors. Case IH Hydraulic Rockshaft Arm Clevis Pin Lock Plate part numbers: 350188R1, 350188R2. This plate is used for BOTH left and right Rockshafts on above tractors. ALL Farmall Tractor Hydraulic related parts