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i replaced with a regular nut/bolt combo... some people would advise against but honestly, i have not noticed any difference using just a nut/bolt combination... well except for it costing me less than $4 in hardware.

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Not sure if this would work for you nowadays but I was able to go to a dealer who was replacing the cats under warranty. They use all new hardware. I asked if I could have the ones off the one they took off and they gave them to me for free. Not sure they do too much replacements anymore though.

You can get a universal pack at autozone for about 10 bucks.