I have just received a few parts of black painted metal that attach to a cowl edge.The parts are US letter/A4 sized and slightly domed.
The parts all have similar stamps:
368 C2 25 03645 - spacer plate
368 C2 42 D863 - angled plate to join cowl edge to sub structure
368 C4 X PA806 - A4 sized panels
In addition there is a very faint inspectors stamp on the angled plate - circle with letters around the circle and a number below. The first two letters are WB or WE
The edges have a yellow chromate paint - so US or British - I assume.
Some pics:


Anyone got any ideas ?