Have you looked at the camaro white book? You can take the total number of coupe's and subtract the number of removable roof panels (RPO CC1) for that year. That should equal the number of hardtops made. How many of them were Z28's? I couldn't tell from the book.
Example: 1999 Base Coupe = 23,429
+ Z28 Coupe = 14,749
-Roof Panels = 23,930
Number of Hardtops = 14,248