[Vwdiesel] TDI glow plug

[Val Christian]

I have a 2003 VW TDI Jetta, and am getting a code (vagcom) for 
intermittent glowplug(s).  

My local foreign car parts store doesn't have a gp for this engine.
I did a little digging, and am wondering if someone can verify 
the following:

12mm gp is for coolant

10mm gp is for engine start
	possible Bosch #80028
	possible Champion CH271

Anyone have better data?

Thanks.

Val