Senton 4x4 conversion question

[RetroThutmose]

Had this senton 2x4 a while now. Decided to convert to 4wd but I don't have the spline price for the center drive shaft off the center slipper? I have the old brushed slipper clutch assembly but I think it's too weak for the brushless? Don't see how I can swap the splined piece over, it appears pinned in place in. Am I missing a part? Instructions don't mention anything about this piece.

 

[RetroThutmose]

 

[RetroThutmose]

Dang it! Looks like I'm missing this part.

 

[RustyUs]

Dang it! Looks like I'm missing this part.
View attachment 226524

That shaft should've come with the power module.

 

[RetroThutmose]

That shaft should've come with the power module.
View attachment 226556

Ill have to look around my parts bin. I installed the module but never the front diff

 

[RetroThutmose]

Man I know I have it somewhere, I even found the box it came in