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I'm not sure but do you really need one? I've ridden 10,000+ miles and never had an issue and every stock review I've gone back and read said it didn't need one.
It's not necessarily needing one but if it can be done. I have 38,000 miles on my 2003 F4i and I haven't seen the need for one but I am in the process of a rebuild and was just wondering.