T56 swap question

[powershifter]

I have a 2002 Mustang gt, I'm swaping my old 3650 for a T56 out of an 04 Cobra, I got a driveshaft for the tranny but it doesn't have the yoke that goes to the tranny, my question is do i need a 26 or a 31 spline yoke?

Thanks for the help!