SpeedTek RC lightweight stainless steel spool shaft, bearings (2), cups (2) & spacers (3) kit that fits Arrma Limitless V1, Infraction V1-V2 & Felony 6S!  Does not fit in the V2 Limitless. The center driveshafts are the incorrect length.
 
We use these spools on all of or drag racing & speed run vehicles. The high speed spool kit comes with a 8mm lightweight stainless steel spool, 8mm hardened steel drive cups and 8mm metal shielded bearings.