Enes, nuts that are sumwhat beveled on one end and not on the other are a type of locknut. I believe the ones for a DP are 10MM by 1.75 pitch. They are not a common size. You fill save some time if you can bring in the O2 housing or one of the nuts that fit. They are kind of an odd size.
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97 Viper GTS
03 Mercedes CLK500 rollin on dubs...
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