Or you can go to a larger diameter coilover, Leda's, but to fit them you will need to modify the rear turrets.

but as nIgel says, you do pay for quality, if i was to buy another set for another RST i would definately go to MEF, i have just got some rear suspension parts from them and the quality is superb
The units are built to order so there is a short delay, depends on how soon you want them and how much you want to pay??