As title, one of mine has fallen out.

I don't really want to buy a set of four.

If you've got a cover too, would be fantastic

I take it one has actually fallen out of the wheel so you now only have 4 nuts holding your wheel on!!!

As far as I know each set is unique and has a different key to unlock them. hence if you got one from someone else then your key would not fit it. I know if you lose the key you can order a new one using the code on the set but do not know if you can also order just a single bolt or not. Always worth an as at the dealers.

A new set it is then. Thanks PSM

You can buy one coded stud which will come with a new locking nut.Look @ your locking nut there is a number from 0 to 9 or 57 to 62 or so.Order this at your dealer. PM me if you want parts no.