why are there 2 different sets of lights ?

why did 90- 94 buick regal 2 dr's come with red tail lights and clear tail lights with red reflectors ? was it a limited edition option?... i just called gm and they wanted 1070 dollars for a new set of the clear lense tails! but didnt kno why buick had 2 sets? does anyone know?

I've never seen a factory car with clear/red taillights

yea i only seen them once in a while... but i found a pair and put em on! there amazing.... totaly clear with red lenses underneath... ill post pics of my ride when i get a chance... thanx