locking wheel nut key

hey guys, looked all over on other discos but none of the keys looked the same as mine. mine had 4 little nipples that slotted into 4 holes on the nut, i drove off with it on. looked every where and its still gone. can any of u guys help me out on where to get them from or how to get it off.

heres a pic of wat the bolt looks like.

Std early Disco locking wheel nut. Get on Fleabay.

Also if you hammer a socket onto the nut that'll get em off.

cheers mate, looked on it already but cant find one, bloody thing is winding me up!! ill have another look now.