1969 C10. 4x4 manual steering box

[Powerwagon]

I'm new here and own 2 C10 pickups.
First one is a 1966 step side short box and the one I need help with is a 1969 C10 4x4 long bed 1/2 ton 4x4. It must be a heavy half as it has 6 lugs but you guys would know better than I.
Now I know the K10 is the 4x4 Verizon of this truck but mine is a 292 4x4 4 speed truck and my steering box is junk.
I've looked all over the place and my pitman arm has a bolt that goes through it to hold it to the splined output on the steering box so I'm sure the 2 wheel drive Version even though they look the same and attaches the same the pitman arm is diffrerent.
Can one of you fine fellows direct me to the correct part for my application.
I've pulled the box and it is defiantly bad.