Is it OK to space a Pitman Arm?

I got my steering componants all together. Tonight i started to put them together. I put th eford pitman arm up on the box before and it fit, but up high on the shaft, just below the housing. Well tonight i went to tighten it down and the nut bottoms out on the threads before getting the pitman arm tight. I am wondering if can add a spacer so that the nut will tighten the arm up so i can use the pitman arm? Or is this dangerours. It does fit the splines at the top. Should i avoid this?

 

It will be between the nut and the bottom of the pitman arm. The pitman arm goes right under the housing. Only thing i am worried about is that i wont have enough room to tighten it. right now without the the hold down nut, i have about 1/8 space between the top of pitman arm and gear housing, if i tighten it, then i probably will have to go past the 1/8 to get it to tighten down, so then it will be right on the housing Maybei just answered it myself. Better srat looknig again. Sucks too because i got a tie rod end for this arm

 

No the box and arm are fine. i am trying to use a ford arm. it is very close, but guess not close enough. Going to now ditch thi ford arm adn get a waggie arm.