Hey Ewan,
My clutch is on its way to Jim Berry now, if you have some time to talk then give him a call and he will run you through the details... Your clutch should be the same as mine i would imagine, what are you currently running out of interest?
The feedback from the Jim Berry users is awesome, there are a lot of haters out there too BUT funnily enough most of the haters have never used one and have stories of a mate of a mates car etc which i tend to ignore.
You DONT need to go twin plate for that power level