Mugen MBX4-XR Conversion?

[SilveradoHD]

Got all the parts in today for my MBX4-XR conversion and hit a few snags. The RC-Monster Mugen motor mount fits, but it is a tad too short. The older MBX4 diff sits about 2mm higher. This causes the center diff to sit at an angle if no spacers are used under the RC-Monster mount. It seems that 2 brake calipers without pads are about the perfect height to remedy the problem, although this is kind of rigged and I would prefer the mount to sit flush on the chassis. Would it be possible to get a 2mm spacer custom made to fit perfectly to the mount?

Also, for anyone else doing this conversion on an MBX4. The stock rear chassis brace gets in the way of motor adjustments. I can not get my 13t pinion to work because of this. I had to dremel some plastic off just go get a 16t to work. I may try locating the aftermarket all aluminum chassis brace and this may work better. Also, the included servo mount tray will not work for the MBX4. I may try to mount this somewhere as a ESC mount.