Check the listing for details. WTD-11-002 ROCKFORD TWIN DISC 11" CLUTCH DISK 72T SP111HP3 SP211HP3 Replacement. Condition: New. Listed at 68.00 USD. This is a replacement disc for ROCKFORD or TWIN DISC 11" CLUTCH DISK 72T Used on Twin Disc SP111HP3, SP211HP3, SP111P1, SP111P2, SP111P3, SP211P1, SP211P2, SP211P3 WPT PART # WTD-11-002 Twin Disc Part # A5579E (3 piece), can be used in place of A5579D (solid disc)Rockford Part # 2-03563Morbark Part # 82381, 24541-227Terex Part # 82381 11" Fiber Clutch Disc, 72 teeth, 3 piece plate. The clutch doesn't have to be disassembled for an easier installation process.(It can measure 11-1/2 to 12" depending on how you measure it.) *Can be used as a replacement for the following: WTD-11-001 - A5579E - A5579D - 2-03565 - 11X-132A Used on many clutches such as the following:WPTTwin DiscRockfordNACDPEC If you're unsure of what you might need, feel free to reach out to us so we can help you. Disclaimer: All part numbers are used are for reference purposes only. Davis Power Systems LLC does not claim any affiliation with any manufacturers or companies names listed.