[lincpimp]

Those are the correct gears. Some 8x10 shims would be a good idea. That way you can shim the diff side to side and the pinion in and out to get good gear mesh. Both ofna and hpi make the shims, I would buy both as the ofna are .3 thick and the hpi are .2 thick. I do not have part numbers but you should be able to search "8x10" or 8x10mm" and find them. Or search shims and read 10 pages...