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If you need to plug the rear O2 sensor holes, it takes a 18x1.5M bolt. I went to autozone and got a 18x1.5M oil drain plug. It fits perfect and comes with a gasket.
 

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I used the same fix, except from Advanced Auto. When I asked the guy behind the counter he thought of the drain plug idea as an afterthought, but like you say it works great!!

Steve
 
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