Welcome to the 'bolt!!
Why are you changing the steering arms? (That's the arm attached to the spindle and backing plate) You should've
been able to use the stock arms and the stock drag link
(the straight bar that connects the steering arm to the
pitman arm on the steering box) It sounds to me like you have a later model steering arm that takes a drag link like LONGBOX55
has linked to.
You can either use the newer style drag link or as you said,
you can buy a new ball and have it pressed in and use your
stock drag link.