I find it, but this forum [&:]
Tucker01 wrote it Here->
http://www.rcuniverse.com/forum/m_25...tm.htm#2515699
"The MP-7.5 Sports Readyset (or RTR as some call it) is identical to the original MP-7.5 Sports except for: GX21 engine to replace GS21R, flywheel, clutch nut, aluminium 2- shoe clutch , cosmetic changes. "