[MetalMan]

Batfish - the 8L is not the motor for a 1/8 buggy. If you really want to run one, use 3s Lipo, and not 4s (I have found my 8L to heat up too much on 4s Lipo, but felt good on 3s).

coolhandcountry - Have you seen my buggy? (It's under the electric section). Right now I am basically re-converting it (for the third time!). I have a custom chassis made, that will be VERY strong, and I am making a VERY strong motor mount. I am not using a center diff, but a custom slipper based off the Revo slipper. So, that means that I am working with a completely custom design. Whatever you do, make sure that it suits you.

That buggy isn't a 9.5 MBX, since the 9.5 MBX comes with orange anodized parts. Also, the front chassis brace orientation is different.
It's not the Ultra MBX, because the Ultra MBX has a different upper deck design. It's not the Ultra MBX Pro for the same reason.
It's not the Ultra MBX R2 because the upper deck is different.
It's not the Ultra LX Pro for the same reason.
That leaves it to be ONLY the Ultra LX Comp. This buggy is compatible with the plastic differential gear.

In case you are wondering how I figured this out, I went to Ofna's website and went through the PDF files of exploded views of all of the buggies I knew of that could possibly look like the picture you posted.