Need help with size of bolt.

[aliveguy5]

I bought a pair of used jba catless mids that has holes drilled in it for the o2 sensors and then on the drivers side pipe it has one for an a/f gauge. I don't have an a/f gauge so I was looking to plug that hole up with a bolt of the same size. Does anyone know the size of the bolt I need? It's the same size as the O2 sensor. I can't find one to fit it. Also if this isn't the best route to fix this I'm open to suggestions.

Thanks,

[Junior]

M18 x 1.5

Here are some options (scroll down for plugs):

http://www.thefind.com/query.php?query=m18x1.5+bung

[aliveguy5]

Dude found it in 5 seconds after I went Menards and home depot looking for that... Beans to you.