I went with the Z1 poly diff bushings. The reason: For the rear diff bushing, if you mess up the install and it doesn't seat right, you're in trouble. I knew with the poly bushing that if the install went poorly, I could simply cut it out with a saw-z-all and start over. The poly bushings have worked fine for me ... but I don't launch the car and put undue stress on the diff.
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