gtpro5.0

Hello,i have a question,i have a t-maxx (new version) 4908,i purchased a new exstended chassis for my ofna .32 engine,when it came it was a 2.5 exstended chassis,instead of a 3.3.Anyways i have a 2.5 exstended chassis with 3.3 4908 parts on it,now i cannot find center drives for it and have spent alot of money on several sets of center drives and they not work,what can be done,any help is apreciated,thanks