Hi there,
The first thing that comes to mind is "why would you want to add all that extra weight ?"
I don't know why they had two bolts on the S1/S2 and only one on the TCs, it might have been due to accountants but equally it might have been down to not being needed when they redesigned the suspension for the TC.
Just looking at the parts book, the S2 has both damper & link on the same side, the TC had one on each side. If your new adjustable lower link is rose jointed then it should have enough movement to work, but if it's like mine with an adjustable "middle" and rubber bushes at either end then the angle of these bush housings probably won't work.
I'll stress that I don't know, it's just a guess. Being very averse to spending money, especially if it meant my new links wouldn't fit then I'd just not add the extra bolt !
Brian