i was wrong!😱 The extension adds 6 inches although it will still be hard to instal with the loader arm in the way. The cover parts you need you can get from bates Corp. If you are not upgrading to a 17 gpm pump, you won't see any difference in performance of the hydraulic. I've got 5 tractors converted with both pump and extension and it does make a difference. It will kick up you hydraulic speed but won't give you anymore lift power. IMO I would just put the bigger pump on and forget the extension. It will work fine as long as you don't run hydraulic motors.