Bolt size - flywheel housing to 300tdi engine

Hi,
I'm drawing up a bracket that will pick up on the two topmost bolts that attach the flywheel housing to the 300tdi engine block. I don't want to disturb them prematurely but am struggling to find out what size (thread size and length) they are. Can anyone help? They have flanged heads, the flanges on which are 20mm diameter and the hex head takes a 13mm socket.
Thanks in advance!

Hi Tim,

If you mean the ones in this link items 6.
http://www.allbrit.de/UNI.cfm?PAGE=801687&SPRACHE=EN
Looks like they are M10.

Maybe somebody else can verify it.

Cheers

Great - thankyou very much. Those are the ones.