Hot Rods Spline count of 1972 Ford Courier steering shaft

Hey everyone - does anyone know the spline count on a 1972 Ford Courier steering shaft? I have a MOMO steering adaptor for one but on 6 hole steering wheel and need to replace it (the wheel) probably with a 9 hole, so am keen to find a suitable adaptor to fit the shaft. I thin I can buy a 9 hole adaptor with the spline - just need to know what it is. I am guessing 13/16th - 36 spline??
Cheers