V-Stretch drive shaft length for 50mm ext?

[o0wiz0o]

I'm not 100% sure yet. Mike's site does not specify the length required. Logic states 50mm longer than the stock one but Traxxas don't seem to state the length of the stock shaft and until the V-Maxx part turns up I don't intend to strip the truck.

The longest 6mm bone I can find is HPI but 112mm. I think this maybe too short. Anything longer uses 8mm and I take it that will not fit on a stock E-Maxx diff? I have 6mm UE cups on the ways.