Those ones are from Rovertym Engineering in USA. I think they replace the lower perch. I have seen others that space the perch, but I'm not sure where...
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You could also try these guys, they do spacers and a few other bits.
Land Rover Discovery Series II 1999.5-2004 Suspension Lift Kits
I made my own from discs i had cut from solid 100mm round bar to 30mm sections. Your bigger steal merchants can help with this. It cost about $20 each and then you need to drill the bolt holes. I also had a mate turn them on a lathe just to dress them up a bit then just painted them black.
Cheers
George.
Surely this would be due to the fact the front is not lifted, so imo the back will feel "light" as you describe. This is exactly why the D2 with SLS will not let you drive it in the extended mode over 18mph.
Your best bet would be to fit the same on the front as well, even a 30mm spacer will probably only take out a lot of the sag the front springs have suffered anyway, and only lifting the back will just accelerate that issue even more.
okay mayby a silly question but Are the metal spacers that slunnie posted a pic of, are they legal for road use and also do they require a engineers cert? or is it just simply bolt on and forget?