I believe the 4 door coils would fit. However, I don't see any reason to replace the coils in the rear with heavy duty or non OEM coils. Especially if you just want the car for a daily driver. I though the Cutlasses always had problems with sagging on one side in the rear. I never heard if this was because of the springs or the frame. I thought it was sort of a mystery. 
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"Some men are Baptists, others Catholics. My father was an OLDSMOBILE man." Ralphie Billingsley A Christmas Story 1983
"We rei-eign, supreme, ooooh god! Burrito supreme, and a chicken supreme, and a CUTLASS SUPREME!" Tenacious D 2007
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