71643NBC..Black for my ZL1 reps and just recently put the stockers back on with A/S tire with the same lugs...the black looks pretty good on the silver rim...
and plus 1 on ordering an extra lug key...the second key actually has a better and taller design and will work with 2 diff size lug wrenches...at least that is what happened for me...good luck OP.
btw - another C5 member is sellin these...
http://www.camaro5.com/forums/showthread.php?t=514145
just like mine and a good deal to boot...