sankysvr6 0 Posted April 25, 2014 (edited) Part number 049 127 311 This is the O ring the fits behind the support bracket that bolts on to the engine block, which holds the supercharger. They are made out of Viton rubber which has an operating temp of -25C to +200C. So ideally suited for this application. This is not a genuine item, as they are obsolete now. But I believe these are equivalent to the original if not better. £1.50 Posted first class to your door. Edited June 3, 2014 by sankysvr6 Quote Share this post Link to post Share on other sites