Cross-drilled brake front brake rotors OEM on '96 Z51?

['96-Z51]

I'm trying to figure out if the drilled 13" front rotors on my low-mileage '96 (with J55/Z51) were original to the car. They look the same in detail to the plain rear rotors, and seem to be decent quality (the holes have bevelled edges to resist cracking). Anybody know for sure?

 

[Hib Halverson]

Drilled rotors were not available on any C4. If you have drilled rotors, they are aftermarket.