Help please, Lancaster drawing missing

I’m having great trouble fitting the main control panel with its two side panel brackets to former E. So far the dimensions just don’t work.
I can’t finish the cockpit rail until I’ve got this sorted.

The brute of the E former channel (not the L shaped extrusion) has squared flanges in cross-section, i.e. they’re flat. So there’s an almost triangular packing piece running round the top of the E channel which gives the 10 degree angle that the nose line requires.
The drawing for this – Taper Packing is 2/D.1675
I think this dwg might solve my problem.

Has anyone a copy of this I might be able to see?
Mike