Searching my document archives, I found this....
ASTROROOF AND HATCH ROOF PRODUCTION FIGURES FOR 1987 BUICK REGAL
(Courtesy of a 2007 Kirban Inner Circle bi-weekly newsletter)
Astroroof option (code CF5) =>
2560 total were factory installed for all Regal models
1915 were factory installed for the Turbo Regal models
645 were factory installed for the Regal Limited models
Hatch Roof option (code CC1) =>
9415 total were factory installed for all Regal models
8979 were factory installed for the Turbo Regal models
436 were factory installed for the non-turbo Regal models