I believe you own one of the earliest "Backdrafts" that entered the USA. It was actually a kit purchased in SA and assembled before it was shipped here. The company that made the kit is still in business I believe, though the names escapes me.
I hate giving this response, but you need to speak with Tony or Reg. I suggest you signup at
www.backdraftboys.com if you have not already and ask over there. They seem to monitor that more closely and provide greater detail in responses (when they come).
You have a unique car, as you know... so the shocks we currently offer will not plugin.