Determing model of car?
 

Ok so i am looking at a 1990 rx7, which is basically in pieces. It has the rear end (wheels, axels, pumpkin, coilovers) and the front clip with no body panels. How can i find out what model it is. It is 5 lug, i dont know if that narrows it at all though. Basically i'm trying to find out if it has LSD, and the 4 pistons up front. Anyhelp would be great,
Thanks,
Jason