Some Q's on lst2 conversion

I have been saving for some 6S lipos for a couple years now - i get sidetracked with other stuff WAY to easily -lmao-
Lehner 2230 11t - so much power even with the nimh - i really wanna run it on 7S (3S+4S in series hehehe) Havent driven this in a long time tho - got rid of the nimh packs and have no lipos to suit it -lol-

Forgive my ignorance, but what is the "TDR" mount, and where do you get it? Is "The Dude Mount" the same thing orr?