Depends on what you are putting it into. On my deuce pickup with split bones I used a 33/34 pitman as it had the ball inside with no nut. The 32 pitman will also fit and has the ball on the outside with a nut and is tapered so you can use the later tie rod ends. I did have to file down the large locating serrations in order to clock the drag link. I did not have to bend the arm and I was using original 32/34 tie rod ends. My steering box was rebuilt by Neal Jennings.
Can you give the measurements of the output on your steering box? I had a '40 Hudson for a while and was able to find/use Ford parts to replace some of the steering items. It helped in maintaining the original style steering.
Any Ford p***enger car arm from 32-48 and pickups through 52 will bolt on. They come in a variety of lengths, angles, and offsets. Finding the right one to fit depends on your wishbone situation.