drive shaft length for 12" twister2x???

[hewy01]

Needs your help lads!
fitting up a standard inline6 lower unit to a twister2x midsection!I have the adapter plate, just thought if any of you guys knew
what length does the shaft have to be???? Would save me the hassle of getting it wrong;) cheers appreciate your replies:thumbsup:

[crazy horse]

If you want the length from the matting surface of the case to the end of the shaft, It's 14.750 inches on my NOS speedmaster.