In case anyone else has a chronic case of duma$$,like I did,afetr a fair amount of research and a lot of good info from Volfandt,I discovered that Gator part#96-787 is a direct fit for RCK60 decks,provided the deck has splined spindle shaft and blade spacer,with a 30mm head on the blade bolt.I mistakenly assumed it was a 7/8 mounting bolt until I pulled them off,and had all my adapters lined up.Blades are 20.6" long with a 1.13" mounting hole,according to sticker.Hope this helps.Thanks Volfandt.