All of our new parts are aftermarket replacements. Compatible with John Deere Tillage(s) 400 (SDT), 500 (SDT). Replaces John Deere OEM Number(s) A20702, B1024A, BA1024A. Replaces Mfg Number(s) HS316. Manufactured from heat treated high carbon solid grade material, fitted, bolted and polished. Compatible with John Deere High Speed Series and SDT Plow(s): HS356. Bolt Hole

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