Kyosho ZX6.6 Center Differential Set. This package includes all the parts needed to build one complete center differential for the Lazer ZX6.6. This can be used with the standard ZX6, but additional parts are required for installation. KYOLA359B, KYOLA376 and KYOLA378. OR 2x KYOLA377, 2x KYOLA379, with 1 - KYOLA376 and 1 - KYOLA378 for forward mounted motor - OR - 2 - KYOLA377 for rear mounted motor.