1999 RX300 Oxygen Sensor Nut Size for Studs

All

I have a 99 RX300. The Oxygens sensor fell totally out of the exhaust and the nuts that fit on the 2 studs are missing.

Does anyone know the correct nut size to buy when I put it back together?

Thanks

Wholeshoe

I got it. It was a M8 nut that takes a 13mm socket. I stuck the sensor back in pulled the battery cable and cleared the alarm. Then I went for a 2 mile ride and all is well so far.

Wholeshoe