Try this link to the ACO site. I tried but it would not open the rules for the classes, good luck though. It will be good to see a 917 or a 956 again at LM, If you need another driver I might just be avaiable
http://www.lemans.org/24h_mans/aco_gb.html
Mind you,the rules in the past have tended to bend in the favor of French cars and so are open to all sorts of misunderstandings.
Simon