Not sure if any of the mounts will work or not but I emailed Mike and asked about him making me a custom mount for my buggy and he said for a one off mount it would be about $80. Just for your info.
What I ended up doing for my Ofna buggy was using 1/4" thick aluminum that I had bent at a 90 degree angle and I then mounted it to my center diff and my chassis. It appears to be able to handle anything I can throw at it!!