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Well there are multiple bushing part numbers depending on the size of the rear axle and the suspension level the size RPO codes are Y03 for the 7.625" rear end and Y04 for the 8.5" rear end. The suspension grades are FE1, FE2, FE3, FE4, and F41 from softest to hardest. Also the year range of your car 91 - 93 or 94 - 96 as there may be some differences, but can never have too much information. - Peter
 

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So most likely Y04 for the rear end and F41 for the suspension code. The part number for the rear end bushings that the upper control arms bolt through are 527593 and you will need 2 of them. In case of sticker shock at the price of that one there is also part # 10000953 which was used on cars with F41 suspension and the 2.93 rear end. There is also probably an aftermarket part for it as well. Those numbers are from out of the Caprice parts manual, which can be a bit hard to decode at times with 4 different part numbers listed and having to go between all the RPO codes to figure out exactly what is needed. - Peter
 
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