The ARRMA Wheel Axel & Hub Set B - GROM (#ARA311229) is the factory stock composite (plastic) replacement axle and wheel hex kit designed exclusively for the 1/16 ARRMA Mojave GROM. 
It supplies 4 wheel axles, 4 stub axles, and 4 wheel hexes to replace worn or broken stock drivetrain components on brushed Mojave GROM models.
Included in the Package (12 pieces total):
4x Wheel Axles
4x Stub Axles
NOTE* "Set B" fits only the 1/16 Mojave GROM due to its narrower track width—it will not fit the Granite GROM or Typhon GROM.