John is right; however, if a customer wanted the D96 fender pin strips, the dealer would add them as a dealer add-on. My RS Z28 had them on the car but I left them off the car after the restoration because I personally think with the "Z28" strips, the fender stripes look too busy. I think this is why Chevrolet design did not include them as a std. option with the RS Z28. It just depends on someone's personal tastes, but “technically” they did not come on a RS Z28.
Note that the front fender strip is painted too low and extends down onto the lower fender extension. Ref. the factory AIM, pp. 250: the strip should stop 0.08” (about 3/4") above the ender extension break line.
Do you know if your car had these stripes painted on originally?