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all Z06's come with them, but they are dealer installed, so if they don't have them, the dealer left them off. Either way, they are paid for with the purchase, so you should get them regardless.
Side skirts were not standard on MY15 & 16. The 3/4 shirts were standard on the ‘17+. Full length Stage 2/3 skirts were an option on all MY C7 Z06s.
Frankly dealers have a hard time figuring what goes with which!
This chart was made for dealers (I left off the base and Z51 and highlighted what gets a center air dam.) The side skirts, as you note 2/3 size, come with the standard Grand Sport and Z06. It also gets a plastic splitter (some call a poverty splitter.)
The Stage 2 Aero options are a $2995 and $3995 They are both carbon fiber with the more expensive being visible carbon fiber and the less expensive painted carbon flash.
In either case they DON"T come with the car. They are sent to the dealer's parts department just before the car arrives (hopefully.) They have the car VIN on the package. If a dealer sells few Vettes may get put on the shelf! The dealer gets paid extra to install them.