This core is extremely rare and your core is required to fulfill this order. Contact us for instructions on sending your core in for Rebuild & Return.Large pads. Heavy Duty for R43117 & R43117 HD6.The R43117 HD8 15" Transmission Disc, 8 Pad, w/ 1-3/8" 21 Spline Hub - Reman fits equipment brands such as: John Deere