plug sizes on ATR stage II headers?

[summit]

Need to cap off my stage II headers where they have the bungs for EGT and O2 sensor. I know the O2 sensor size, bu I forget to measure the EGT before installing them on the car. Anyone know what size that thread is or what type of plug I need??
thanks,
Greg Kring
Arlington, Texas

 

[EightSecV6]

1/4" NPT