Rear end question

[floridasteve]

I have a rear from an older firebird now installed in my truck. I just got info on a rear that is from a 93-02 camaro, posi, and disc brakes. My question is if this will work or if it is too wide. I was told that the rear is about 61" rotor to rotor. IF I remember correctly my rear was about 55 inches backing plate to backing plate. The price is right on this rear if it will work. Also I forgot to ask if the bolt pattern is 5 x 4.75. I was told it came out of a 6speed z28 and it has 3.23 gears. Thanks for the help. I believe my rear was about an 1980 trans am .