Ok i Just fitted the TS2CD to my R34 and must say thats its the best mod yet.
The "B" and The "C" stand for the Disk Size with "B" = 204mm disk and "C" = 215mm size disk.THe "D" stands for damper meaning the clutch disks are sprung for less violent shake up.
I have the 600hp rated clutch and its awesome a little hard to push but makes up for it in changes and launches.I had to convert it to push type from pull not sure in the r33 tho.
My clutch has the steel cover.As far as i thought the aluminium cover on comes on the multi plate.Anyhows get this clutch you wont regret it.Hope that helps
Age