I need a plug for a post-cat O2 bung. Two questions: What is the pipe size (maybe M18-1.5)? Also anyone know of a source? Thanks.

 

Yes, M18 x 1.5

Virtually any place that sells auto parts, particularly exhaust components, should have them. Lot's of them on ebay.

 

Thanks. Local auto parts house (Kragen-O'Reillys) had no O2 plugs. In fact the two stoned kids working there looked at me like I was on crack for asking. Took a stroll through the aisles and found a tree-shaped air freshener, a furry steering wheel cover, lots of toy tools from China, .. and a M-18-1.5 Toyota oil drain plug. Ebay, as suggested, had a boatload.