Here's some measure pics for you: the measurements are in inches except the input and outputs shafts I took in metric because most rc stuff seems to be in mm for shafts.
Head:
Width:
Body length:
With cover opened:
Bushings:
Output side (OD):
Output (ID):
Note that it is threaded, I didn't have measurement too for threads but I believe it's 8/32 thread. I can double check that Monday.
Input shaft (OD):
Input shaft length:
Inner Shaft (OD):
Inner shaft length:
The outer aluminum cover threads off near the output side, and Let me know if you need any others I'd be happy to help.
--Dan