1987 300D - correct Bosch glow plug part number?
 

I'm looking at plugs, and I see listings for Bosch part # 80006, 80007, 80008 and 80031.

The 80031 shows following cross listings:
MERCEDES-BENZ 190D 1987
MERCEDES-BENZ 300D (1987 - 1993)
MERCEDES-BENZ 300SD (1992 - 1993)
MERCEDES-BENZ 350SD 1991
MERCEDES-BENZ 350SDL (1990 - 1991)
MERCEDES-BENZ S350 (1994 - 1995)

The others show many older models. Is the 80031 the ones I want for my OM603?

Thanks!

Nevermind, I found the answer here:
http://www.peachparts.com/shopforum/2593262-post20.html

Looks like the older style heads take the 80006 plugs. as a sidenote, how do I know which OM603.xxx engine I have?