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Look on the RPO data plate. It will be a sticker located on the uderside of trunk lid or in glovebox. It'll be a 4x5" sticker with a bunch of 3 digit codes. Look for WX3. Thats' the RPO for the SS.

If you want more info, PM me the VIN and I can tell you more about it. You have 20 min left today or wait till monday.

Also. look at the top of the antenna. A caprice is round, an SS is hex.
 

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