Beats me. It is mentioned three times in the ad text:
Fully restored Norwood built X33 Rally Sport Z28 with 37,000 miles
A genuine X33 Rally Sport Z28...
special badging that were part of the Rally Sport package...
Text also mentions headers and body-color bumper, not seen in the photos.
A poor ad, composed by someone that is not knowledgeable about 1st Gen Camaros and his own car.