Re: SPC lower control arms question
It's a load spreader and re-inforcement. All the load is trying to push the bottom mount out through the bottom of the A-arm. Same bolts that hold the shock also locate the plate. IMO a very simple and effective deal.
We used to make these out of 5/16" plate when we were racing Chevelles on 3/8 and 1/2 mile dirt tracks. Ours were made with a cutting torch, not nearly as pretty.
Tom Terrific or Terrible Tom, depending on the phase of the moon, passing cosmic rays or other factors not fully understood except by my wife.