Help!

[Jesse 67 c-10]

I'm trying to finish up my 327, five speed swap, and disk brake swap but I'm having a few problems. All I have left is the driveshaft, hydraulic clutch hose some brake line to bend. My 5 speed is out of a 90 chev 1/2t, a getrag (nvg3500) The output shaft is 32 spline. A new slip yoke is $250 so I'm going to turn down a 32 spline yoke that I found in a yard, the outside is too big to fit in the tranny. My problem is this, I can't find anywhere what the outside dimension is sposed to be. If I go too small it won't ride on the bushing in the end of the tranny. There are none of these yokes in Saskatchewan to measure and I havn't been able to find a mechanic who can help me! Does anyone have one, know specs or know if it's the same as a th400 yoke(also 32 spline)? I want to drive my truck! Help!
Thanks
Jesse

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Near Saskatoon, Saskatchewan, Canada. 67 c-10, Long fleet, Newly swapped front disks, 5 lug rear end, 327 v-8 with Vortech heads, edlbrock performer rpm air gap manifold, 1406 carb and comp XE 256 cam. Backed by a getrag 5 speed and 1 piece driveshaft. Finnally running, almost driving! www.geocities.com/chevy67jesse