MM (mid mount) is 98mm as opposed to RM (rear mount) 94mm.
Although you can buy an aftermarket MM mount that is 94mm.
MA010 bodies are usually too narrow for the MR02, otherwise besides wheelbase they are all the same.
I don't know where your looking but there is a huge selection of bodies for the MR02.
Try looking at Kenon
http://www.kenonhobby.com/Auto-Scale-Body_c_45.html