Im looking for part no# 4F0412109 which is the rubber bush that's located at the top and bottom of the front springs. But it seems that you can't actually purchase part no# 4F0412109!! Strange! Apparently I have to buy part no# 4F0412066 which is the metal spring seat and includes part no#4F0412109 the rubber bush. ( 1 part no# for 2 parts)!! which I dont need. So am I really having to buy 4F0412066 for the part I need "4F0412109" Is there anyone that's fitted Bilstein's that could shed some light on this as I'm baffled. Bilstein include the metal spring seat disk but not the rubber bush, Audi don't seem to sell the rubber bush without the metal seat disk. What a faff!