GM 12-bolt offset question

[Nine Ball]

Anyone know for sure what the offset distance between the end of the axle tube and outer face of the wheel mounting flange on the axle is for a 67-69 Camaro 12-bolt rearend?

I'm trying to order some rear disk brakes, and they have two offsets listed for C-clip style 12 bolt rearends:

2.81" offset, or 2.75" offset? Also known as "standout"

If I remember correctly, it is 2-13/16 for small GM rearends, so 2.81

Anyone confirm?

Thanks,
Tony