Hi
For the body panels the S2 pre and post facelift are essentially similar. The pre facelift cars have a physical book of parts you will find offered on Ebay etc, there was also a S1 book so be careful to get the correct one, and is also in a PDF that is sold on CD by Viva Lancia site, see
https://viva-lancia.com/specials/cd/beta-cd.phpFor all the facelift cars the parts book was supplied on fiche. There is a copy of one of the fiches here on the forum kindly supplied.
See
http://www.betaboyz.myzen.co.uk/forum/index.php?topic=4958.0Peter