Massimo Castagnola at Fiat's historic archive will supply build sheet details (for 45 Euros).
It should be borne in mind that there were several blues, and greys, so the information Fiat supply might not be definitive. Interior should be clear though (almost certainly either grey or brown wool cloth with corresponding vinyl).
massimo.castagnola@fgm-cc.com or
centroarchiviostorico@fiatspa.comThis is a super-efficient service, and the owner should have the details in a couple of days at most.
Here's an example of the kind of information that is provided:
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Dear Mr. Corke,
here are the information available in the original register of production of Lancia Aurelia B20
Coupé with chassis B20*2959:
manufactured :11/6/1954, body color blu, interior rag (panno) grey, body (scocca) n. 002000,
engine (motore) n.3640, differential gear (differenziale) n. 1083, suspension ant. ( sospensione ant.)
n. 1991, drive box (guida) n. 2033.