The stock wheels are pretty much worthless, even in like new condition, but that doesn't stop amateur thieves from taking what they think are fancy valuable wheels off a nice looking car. Which is pretty much all the locks are good for. Because they're hardly going to slow down a professional thief, or even a shade tree mechanic like myself.
The far more likely scenario is that you lose the key, (or in my case, never get it from the previous owner) and the guy at the tire shop who rotates your tires damages a wheel removing them 4 years from now and you end up a few nuts short of a set.
But to answer your original question, look for lug nuts that are "spline drive." They are closer to OEM in diameter and appearance then the face drive ones that are common now and pictured below after I removed it from my car.
2007 Solstice GXP
#3 ASP, DET and NWOR SCCA
"It's a Kappa - not a classic"