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The CC2 hardtops from 89 on will fit with no problems. When it says "all pieces" make sure you get the ratchet for the rear decklid bolts, the brackets and the 10 bracket bolts (two of them have smaller washers), and the slide-in decklid protector.
Be careful with the initial installation. When a car was ordered with a factory hardtop, the convertible was built on the Bowling Green Assembly Line and then transported to the American Sunroof Company in Bowling Green, where the top was fitted to the car. When the top was installed, it's possible that minor adjustments were made to the side windows to get the top to fit and the windows to seal. You may find that the door windows wil have to be adjusted slightly if there is any interference especially at the upper corners.
Also make sure the weatherstipping on the hardtop is in good shape. The hardtop weatherstripping can run into the high hundreds to replace!
Early '89s did not all have the option available initially. The way to determine if your's did is to check for the B pillar mounting brackets just forward of the folding top pivot, the captive bolts in the windshield header bracket, and/or the rear deck release. If your rear deck release is off center to the driver's side, then you're OK. If it's in the center and operates on a pivot, your car most likely will need a little modification to get the top to mount