Replacement for the certain Twin Disc model SP111HP3 PTOs and the WPT Power model P11-12AC-000 mechanical power take-off clutches (PTOs). This all new unit comes complete with a replacement drive ring and pilot bearing. If you have any question whether this is the correct replacement for your PTO you can view the detailed plans and specifications for this unit HERE, or call us and we can make sure you get the correct replacement PTO to get you back up and running. This PTO MIGHT also work as a replacement for the Rockford 4-34510 & 4-34200, NACD 434510AM & 434200AM, Detroit Diesel PN: NA000212, John Deere pn: RE524652 7 AR70179, Husker Power Products pn: HP24002 & HP2-40-02, Leach pn: 3735-0022D &37350022D PTOs, but due to some minor dimensional differences you should confirm these dimensions will work for your application by reviewing the plans and specifications. If you have any question whether this PTO is an appropriate fit for your application please call us at 866-821-2468 or e-mail info@foleyengines.com; We want to be sure you order the correct PTO for your application.