Stop by your local vw dealer and have them removed. Its stock vw lock. Flat fix place should be able to help you too.
You may be able to source on online, but you will still need the code for the key. What brand wheels are on the car? BBS? Usually when you purchase the lock set it comes with a key code to obtain a replacement in case you lose it. Since you do not have the code you may only be able to find out what it is by going to the dealership.
as people have said, stop by your parts counter.
the security adapter comes with one bolt and is sold as a 2 piece set.
It should be around $8-10 IIRC when I had to buy one after I found out after 500+ miles of driving the tire place failed to put it back in its spot.
You can't just request one because the parts guy doesn't know that you own the exact car it goes to unless you drive it up there so they can see it in person and match one of the other three security bolts.
It really isn't that hard.
//////////________Last oil change: 49,200 / 19 Nov 11 (next change 55k) >> Hello Kitty Motor Oil <<
//////////________MTL changed 19 Nov 11 (good for another 49k)
//////////________Milestones: 50,000mi on 6 Jan 2012
> In memory of Cadet Peter Quick; may peace be with you and your family.