Lazer ZX6.6 Center Diff parts list have been listed on Kyosho America's web site...
Consolidated from Kyosho America's web site:
LA375 - Center Diff. Gear Set(ZX6.6)
Center gear diff set for Lazer ZX6.6. Requires additional parts to install on ZX6. (LA359B,LA376,LA377 or LA378, and LA379.)
LA359B - Center Mount Set (ZX6.6)
Revised ZX6 upper plate for use with the center differential on the ZX6.6.
LA377 - Center Drive Shaft (79.5/ZX6.6)
Center driveshaft for Lazer ZX6.6. Used for front and rear when using rearward motor mounting positon.
LA379 - Joint Cup Cover (ZX6/ZX6.6)
Joint cup covers for Lazer ZX6.6 center diff.
LA376 - Center Drive Shaft (71.5/ZX6.6)
Front center driveshaft for Lazer ZX6.6 when using center diff and forward mounted motor.
LA378 - Center Drive Shaft (88/ZX6.6)
88mm Center driveshaft for Lazer ZX6.6. Rear center when using center diff with forward mounted motor position.