I fitted one to the LH side of my ST last weekend as the BMW garage advised it was required when they did the 1st 6k service. However, on removing the old one I found it was of the new type, and was in perfect working order. Of course as I'd gone to the trouble of popping off the TB and removing the guide tensioner I though I may as well fit the new one anyway as I'd paid the £50 for the parts. So if anyone whats to try my perfectly good old one just give me a shout.