Need 10 bolt rear Carrier for buddy's firebird

[cobrarwanab]

Looking for a posi trac rear carrier for a 10 bolt rear! Doesn't need a ring and pinion due to his 373. Let me know what you got!
Thanks
Dave

 

[Detroit Gearbox]

10 bolt what? gm? 8.2 8.5 7.5 or somthing else?