John Deere 3020 (SN: Up to 122999) – Adjustable Long Wheel Base John Deere 3020 (SN: Up to 122999) – Adjustable Short Wheel Base John Deere 3020 (SN: Up to 122999) -Double Front Wheel John Deere 3020 (SN: Up to 122999) — Non Adjustable Front Axle John Deere 3020 (SN: Up to 122999) – Roll-O-Matic Front John Deere 3020 (SN: 123000 & UP) -Adjustable Long Wheel Base John Deere 3020 (SN: 123000 & UP) — Adjustable Short Wheel Base John Deere 3020 (SN: 123000 & UP) – Double Front Wheel John Deere 3020 (SN: 123000 & UP) -Non Adjustable Front Axle John Deere 3020 (SN: 123000 & UP) – Roll-O-Matic Front John Deere 4020 (SN: Up to 200999) – Adjustable Front Axle John Deere 4020 (SN: Up to 200999) – Double Front Wheel John Deere 4020 (SN: Up to 200999) — Non Adjustable Front Axle John Deere 4020 (SN: Up to 200999) – Roll-O-Matic Front John Deere 4020 (SN: 201000 & UP) — Adjustable Front Axle — To 263456 John Deere 4020 (SN: 201000 & UP) -Double Front Wheel — To 263456 John Deere 4020 (SN: 201000 & UP) – Non Adjustable Front Axle — To 263456 John Deere 4020 (SN: 201000 & UP) – Roll-O-Matic Front — To 263456 John Deere 4320 – To 013589 John Deere 2510 -Adjustable Front Axle John Deere 2510 – Double Front Wheel John Deere 2510 – Roll-O-Matic Front John Deere 2520 -Adjustable Front Axle John Deere 2520 -Double Front Wheel John Deere 2520 -Roll-O-Matic Front   -S307