Most auto parts or hardware stores should have them. They will have a hex head or 3/8" square drive if memory serves.

 

autozne and A&A have them.

 

You could relocate the IAT sensor there with an adaptor, but DO NOT try to hook up vac accessories there. That runner is for the #8 cylinder only and you won't get steady vacuum there. I plugged mine with a steel 3/8's NPT plug and some nickel antiseize.

 

Thanks for all the input. I went to the parts store this morning and got the plug that I needed. It was a brass plug with a 9/16 head. I put the IAT in the new CAI that I installed and the install is now complete. So far no leaks and everything is running great. I plan on posting pics of the disassemble and complete so everyone can see it. Truck has a completley different attitude.