This is copied from an email where I told someone how to make them, some time ago:
MCMaster Carr:
(4) 4444T231 (Steel Ball Joint Rod End with Grease Fitting 1/2"-20 RH Fem Shank, 1/2" Ball ID, 1-1/16" L Thrd)
(1) 98957A809 (ASTM A193 Grade B7 Alloy Steel Threaded Rod Plain Finish, 1/2"-20 Thread, 2' Length)
Local auto parts store:
(4) 1/2-20 lug nuts that use a 3/4" wrench
Local hardware store (or Fastenal, or McMaster, if you don't have a good one close)
(4) 1/2-20 x 3.5" long bolts, grade 8
(4) 1/2-20 prevailing torque nuts (nuts with a crimp on one side, so you can't put them on by hand. They take a wrench the whole way.)
(8) 1/2" grade 8 lock washers
(4) 3/16" tractor pins (the kind with the ring that flips around to hold them in place)
So, you cut the all-thread and put it into the heims at whatever length works for your setup (I usually go ~1-1.5" or so longer than stock). The heims are done.
Onto the bolts... While there's still a bolt head put the lug nuts on tight to the end of the threads, with the taper pointing toward the non-threaded part of the bolt. Then cut off the bolt head, and clean the cut up.
Next, stick the bolt in a vice on the drill press, and drill a hair bigger than a 3/16" hole ~3/8" from the freshly cut end.
Now, you just put it all together. The order goes, from the cut end:
- cut end
- tractor pin
- lock washer (this just spreads the load out. Pins seem to bend on occasion without the washer there)
- heim
- lug nut
- mounting flange on the control arm
- lock washer
- prevailing torque nut
Somewhat like this, except with female heims and only 1 lock washer where the nuts go: