85_SS said:CL (custom luxury) is an interior option, not a model. The CL option was available on SC and LS models. It's commonly mistaken for a model though due to the odd fact GM put CL badges on the exterior of the car.
81-early 86 base models are SC's. late86-88 base models are LS's. And of course the SS option was from 83-88. There are really only two models at any given time, they just changed the name of the base model when they updated the front/rear clip/trim etc. for the LS.
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