Question on Lower Ball Joints for Front Discs

to switch from 72 drums to 73 discs, I think you need ALL the 73up parts;
that is both control arms and spindles.
I said, "I think", lol, cuz I only did this once and it was a loooooooong time ago.
Thanks AJ, yeah I think the spindles might be longer the drums up front, if I remember right. I'm trying to convert without breaking the bank, so hoping to only buy the parts I need. Any recommendations on sourcing just the spindles?