installing a 37 steering box in a 36

[CP]

Hello all, Long time. My car is all set thanks to many of you helping me out with all kinds of issues.

I am currently helping my 79 tear old dad work on a 36 that he wants to put a 37 steering box in.

We installed the box, lined up the bottom hole, slotted the middle hole slightly, and welded in a threaded stud for the top hole. So the box is in...

I'm looking for a pitman arm...

After researching a little here on the barn, I got a part number #21-A359-3015.

I called my antique dealer and he has no info on this part?

So I was wondering if anyone could give me an idea of how long the pitman arm should be.

I also read that using the original; light switch may need consideration.

anyway, Thanks again for being here and I'm sorry my dad won't just keet the 36 box that fits like a glove. He claims its like having power steering...

thanks,

cp