Hmm.... You just might be in luck, if your willing to spend a little bit of money. The lug looks to be a 'Gorilla' lug nut. The key model for it is 1921SD search around you can probably get a key shipped to you for about $10 dollars or so.

Here you go I did a little bit of the work for you. I'll also post up a picture for you when I get back home this afternoon, and you can take a look for yourself to see if its a fit or not.

Gorilla Lug Nut Key