i have the 2005.5 a4 b7...... i had american racing wheels "casino". rims. and they were 5 lug (like my audi ) so i put them on....... thats fine.. but theres no wheel center cap to hold the wheel on the hub........ well there was the ones that cam with the rims but there r to big for the hub on the audi.. so there no point of having them on,.. they dont do anything.. but i get a lil vibration when the speed goes up.... had them looked at n dude was like u need to go to an a&a or sumplace and have them order u center caps that fir.. cuz its just the lugs bolted to the wheel........... so i called to order sum n they cant seem to find a set or match or sumthing..... can anyone help on this situation.. i meansured the a4 and it was 2"across the hub and the wheels were 2 1/2 across..... i told that dude that but he said it wasnt showing this or sumthing. so i was like let me see if i can get sum research on it here cuz he didnt really have anything to say......... so thats where i am lol

 

You need a Hubcentric ring not a center cap. the size you need to fit would be whatever the bore is on your wheel to reduce to AUDI 57.1mm bore. I would check with your wheel supplier on their bore size.