The motor mount came from a fellow rc monster poster, his URL is www.eaglesviewaerial.com/products.html and he does fantastic CNC machining in metal and carbon fiber...
His name is b0gh0s. I was going to have him custom make a motor mount for me for my Revo, but he got too busy. His current mount wouldn't work with the XL motors because they were too long and rear wires would hit the suspension arms due to the mounting height of the motor.