How essential is the rear sway bar on a TD5 D90?

The X Deflex only comes in a 110 version. It fits a D1 or RRC with the addition of either a 30 or 60mm spacer and a pre-TD5 90 with a specific 90 adapter. For the D1 and RRC they even include instructions on what to measure in order to find out what spacer you need. And yet they are adamant that it will not fit a TD5/Puma or Tdci 90. It seems unlikely that it could be made to fit a TD5 90 just using a spacer.

lightning said:

I wouldn’t “uprate” the ARB
Just fit a standard one. You can get new “take off” ones from Twisted for next to nothing.

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Can you send a link? I have searched the Twisted site and can find some very expensive suspension kits comprised of fairly standard looking components, but cannot find anything for next to nothing let alone a "take off" ARB.