There is a bracket which, if you can get one will allow you to fit the pre-load adjuster to the frame under the seat. I believe it was part of the DP kit or may be standard on an ST4s. Here's mine
I'll see if I can dig out a part number
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Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers!
S4 Fogarty, S4R 07T, 748, Series 1 Mirage