I replaced lower joints on my 126 a few years back. I could find no way to make any generic press work. I have the Harbor freight kits, and a hydraulic press, and I worked prettty hard to figure something out.
the problem is, the joint goes in at an angle, and a normal press just cannot access it. Therefore the only way is to use the special press made for this application. I can't remember cost, but it's close to $200 I think.
Someone here may rent the press, I think Performance Products rents it.
After trying many things, I took my arms to the local MB mechanic and he pressed them for about $50.

Maybe someone knows a "shadetree" way to get these beasts into a 126; I'd sure like to hear it!

DG