Evolution Part Numbers are as follows:
EV:1010-3031 Special Ring Gear Bolts (Pack Of 6) For EV:1010-1261 Only.
EV:1010-3041 Special Ring Gear Bolts (Pack Of 6) For EV:1010-1521 Only.
EV:1010-3021 Evolution Industries Ring Gear Replacement Bolts. Except EV:1010-1261 and EV:1010-1521 (Pack Of 6).