Rally Design RD2440 Metal locking fuel filler cap kit | eBay

Not bad, saves the cost of postage on the normal Rally design price.

They were the ones i sold for a while. The annoying thing is Rally Design had them made in China and didnt tell them the holes had to line up with the lock. So the bolt pattern is all over the place.

I told rally design but they weren't interested.

That's a good buy well spotted. I bought mine from rally design about a year ago and payed more than that. If it's the same as mine be aware that when unlocked the key can be removed, requiring the cap to be tethered for IVA (although I could be wrong).