You can buy new balls for everything. However my experience has been the metal isn't as hard as the originals and will wear egg-shaped pretty rapidly. At least mine did that in a year or so of use, which made all that work pretty useless. Personally I look at this like toilet paper. You can get by using sticks and leaves and rocks, but who really thinks that's a good idea?

~ Jon
1952 1/2 ton with 1959 235 | T5 with 3.07 rear end