Have anyone ever worked out where to find paint colour/code for areas such chassis, strut towers etc?

In my case, I would like to get as close as possible to original on parts under the bonnet.

Chassis leg, strut tower etc.
Exterior is Stornoway Grey 907.
Under bonnet some sort of flat grey-ish.

Click image to enlarge

I think you will find it's either the "E" coat where the shell is dipped during manufacture, the colour coat with no clear coat or the colour with clear coat...

 Pete
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2014 L405 Autobiography SDV8 4.4 Loire Blue Ebony interior
2012 L322 Autobiography 5.0 Supercharged Ipanema Sand Sold
2011 L322 Vogue SE 4.4 TDV8 Baltic Blue. Sold
2002 L322 Vogue 4.4 V8 Epson Green (Fatty Offroader) Sold
-Click for Project Fatty off roader-

Very likely correct Pete.

So far I found following:
Chassis legs as well as strut tower is a little lighter grey then the wheel arch reinforcement.

Click image to enlarge