Hi,
I'm Building A 73 L-t Camaro, Anyway I Just Got A Set Of Center Caps #3989479 & I'm Not Sure If There Real Nos Like I'm Told Or Aftermarket, Anybody Know How To Tell If There The Real Deal ?
Thanks Rob

Gm still sells the caps. These are the chrome caps for the Z wheels with the blue bowtie. Found it listed at GM parts direct

GM PART # 3989479
CATEGORY: Wheel Hub Cap/Trim
PACK QTY: 1
CORE CHARGE: $0.00
GM LIST: $107.32
OUR PRICE: $65.86

Scott