Need advice with power steering conversion

[thewrai6th]

My power steering conversion was going very well until I found out the rag joint is not the correct one for the power steering gearbox I bought, it's too small.
I measured the input shaft on the gearbox, and it is 3/4" (13/16" is too large). If I were to count the splines and keep counting across the flat spot, it would be 36 splines. If I stop counting it's 30 splines.

So, is the 3/4" 36 spline the correct rag joint for this gearbox? I can't find one locally, so I'm going to have to order it.

https://www.napaonline.com/en/p/PNB391038