Hi just bought a Z3 and the passenger window is slow. Took the door card off and the rear window guide U shaped velvety brush is missing (hope that makes sense). The bit in the guide that centralises the window as it goes up and down. Ive taken them out of cars in the past and they just push into the guide. Does anyone have one to sell or know where to get them, BMW want to sell me the whole guide rial. Thanks Terry