I'm having difficulty obtaining the o-ring on the Disa valve on my 2.8 tu . Seems yet again that BMW cant supply and all the usual aftermarket suppliers I have contacted have none left. ie Bmw, Schmiedmann, Onlineparts, LLL. Anybody got a new one they haven't used or can suggest a supplier who still has one. I will clean and refit the old one but I was wanting to replace it. Cheers