ORIGINAL: revo_sbs
I know rc monster makes one. Other than that I would look around on the last couple of pages if you haven't already.
ya they make a motor plate that replaces one side of the center diffs holder.
Here's a pic of my center gear with my battery tray. (BTW the motors not meshed its just a placeholder for now)
I cut a pede chassis down and cut to slits in the sides so I could run a battery strap to hold the battery in.
Motor mount
http://rc-monster.com/proddetail.php?prod=rcmcrt.5mm
they also make a full conversion kit that makes it longer
http://rc-monster.com/proddetail.php?prod=rcmcrt.5kit
I only spend $35 on the conversion so I'm happy
I currently have to get it a new ESC though seeing I needed the ESC that was in it in something else that is operational.
Only reason I really stopped running mine was due to issues with the front C-hubs, and knuckles. Think I had too powerful of a BL system in mine(4000kv 60A) that caused the C-hubs to split in half, which then ripped the knuckle up bad. I gotta get a 35A setup which should be good for it, and try it again.