I have replaced 2 of my glow plugs. I bought them from this company in San Diego, USA. They were a perfect fit.
http://store.europarts-sd.com/glowplug2007-2009.aspx
They were extremely easy to fit with a long extension socket. Far easier than described in the notes. Easier than spark plugs to remove.
If you won't the socket size needed I'll check the one I bought for a few bucks ex Super Cheap Auto.
The cylinders are numbered: front R/H side is #1, next #2, then #3 at the rear of the R/H side. Then the front L/H side is #4 , #5, then #6 at the rear L/H side
I trust this helps.