Doc, we took the diff pulleys off the store a while ago -- we have no more pulleys of any type, and the X - 7 pulleys will be different. Please refresh your store page to be sure it's correct. I just checked and they are not there.
We haven't thought about an undertray for the X - 7. It will be a flat piece of CF with the body fitting tightly around the chassis. It will be easy for you to make an undertray by simply cutting out a piece of Lexan and gluing it on.
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