IPD still occasionally makes up a batch of them - give them a call. I think if they are out they wait until they have about 10 firm orders, then they run up a batch of 15 or so. So its possible they might have a set around at this moment. Give them a call. They had a set on the shelves a couple of years ago when I asked. About $300 - and it really transforms the way the car handles. Just as smooth over bumps, lean reduced by 90%, understeer neutralized, and less wobbling on the highway behind semis.

One caveat - you'll probably need to brace where the rear bars mount on the body - they just hook to the pans under the rear seat and the considerable force will rip out the unbrace metal in a few weeks. I welded in some shallow channel iron between the rear bulkhead and the seat spar which has held up for a long time.