Third Generation Firebird

Bought this Firebird used around 87-88.  It had fender flares and rear deck
spoiler similar to 2nd generation Trans Ams and a black metal louvered rear
window sun shield. Otherwise the bird was a stock V-6, automatic. I've never
seen another like it, and was told by dealer it was a special order factory trim
package. Don't remember what year the car was.
Have always been curious about the trim package, and just rediscovered this
photo. Any info about this unique variant appreciated.