I should be getting my A3 next week. I have decided because the rims are in good nick I am going to add another set of locking wheel nuts. When I put my vehicle details on the Mcgard site (A3 2006) it comes back with 28018SU the better version are the 28018SL which have the same dimensions but are strangely not given as an option when I do a search on my car. The problem is I have the 18" 20 spoke alloys which were an upgrade and I don't know if they use the standard bolts or if the bolts are longer or have different dimensions from the standard ones. Does anyone know?