Pitman Arm Connection

I'm trying to correct the steering on my roadster that has shitty turning radius.
The steering box is from a 1956 f 100 truck
The pitman arm is really short (it may have been cut and drilled) so I bought a longer one to improve the radius.
(see attached photo)
The existing short arm has a hole on the bottom of the arm to attach it to the tie rod.
The new longer arm has a knuckle at the end.
Does anyone have a suggestion how to attach this new knuckle end to the tie rod?

Thanks,
Zulu

 

Buy yourself a '60 pickup pitman arm. They have a tapered hole like you need.

 

Cut off the end of the new pitman just past the ball. Drill a hole the diameter of the small end of the tapered hole, then run a tapered reamer into the hole to make it fit the tie rod end. Add nut and cotter pin, then steer.