New Old Stock Front Landside for Ferguson AO Series Moldboard Plows.
Ferguson Plow and aftermarket part numbers: 12I-AO-173, 12IAO173, 121-AO-173.
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The mounting holes are 4 inches apart (center of mounting hole to center of mounting hole).
This landside is for the "Chilled Iron" (cast iron) Type "I" Ferguson AO plow bottom not steel as used in later models Ferguson plows.