[Keller]

Any data from GM did not indicate how many of any sub-model were produced with a particular option. Therefore, there is data on how many '86 GNs (WE2 optioned Regals) were built, and there is likely how many astroroof cars (CF5 optioned Regals), but not how many with both options.

FWIW, it is considered a fairly rare option and others have observed that the majority of Regals that have the astroroof option seem to be GNs or T-Types.