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Full rear coil overs are available from all the racing damper suppliers - Bilstein, Koni, Spax, AVO etc etc in Europe. I would keep to a European supplier that is fully conversant with the typical road conditions on this side of the pond so you can be more confident in their recommendations. Spring rate will be determined by the corner weights of the vehicle and the maximum available compression (essentially how heavy/low the vehicule is)
The same is true for the front of the vehicle and if you have a two bolt strut then the supply is good being very similar to Porsche 944 struts that are used extensively used in racing.
Spax do a complte coilover kit called the RSX but you will have to tell them there are no torsion bars so the right spring rate is given.
Why are you getting rid if the torsion bars? Adding a coil over to the TBs is very practical for a road car whereas without the TBs and the use of a uniball/rod end will transmit road harshness and vibration into the chassis that will be unpleasant. Uniballs/rod ends are best for the track only. Also, unless you use rod ends at the front with spherical top mounts then there will be an inbalance between front and rear suspension.
Clive
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