chassis numbers would be difficult i think, here are some web links that could help...
pictures..
http://www.redshoes-archive.com/
http://www.stillphotography.co.uk/
try contacting triple 8 for chassis numbers, this is the team who still run in the btcc and ran the vectras.
http://www.tripleeight.co.uk/
For drivers have a look at the entry list pages on my site
http://btcc-racing.com/results.asp
hope this helps