Lost lock nut

[Ally13]

Hi there I have lost my lock nut, does any one now what lock bolt I need to buy to get it off? I have seen they are lettered 

[Magnet]

Hello Ally,

Perhaps someone will be able to identify this and give you a number or letter, but have you tried  going into your local dealer and asking them to identify the correct one for you? 

Kind regards,

Gareth.

[niedzial1983]

If its audi oem than they can get replacment