EJPut Posted February 16, 2004 Report Share Posted February 16, 2004 I just purchased oem plugs for my 93 sts, is 91-450 the correct part number? The plugs I had in there were different numbers. Also, the new plugs are not "ribbed". Should they be? What is the difference. I did notice more of a point at the bottom of the porcelin on thenew ones. Link to comment Share on other sites More sharing options...
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