I don't think they were stainless steel. I think they were mild steel as opposed to the original sintered shoe, but I could be wrong. ARH also had a few steel front stock brackets. The original aluminum ones were kind of wimpy.
Zack, if you have a lock up issue and need that little bit of extra set back on the shoe? I can help you with a Stainless "Shim Shoe" that can be configured one of three ways in moving an OEM shoe forward/back or more solidly centered within the comp tube recess slot.Scott