Rear-End Question

[yellowGT]

I am converting the front end with 84 chevy c10 crossmember and the whole nine yards. I hope the go ahead and do the rear end to disc brakes as well since i have been presented with a chance to either get a posi rear end from a 89 camaro or another from a 96 camaro. Now, my question is does anyone know the width of either one of those rear ends? I know it would slap right in since i have a coil truck but not sure if its too narrow or too wide for my 69 swb. Another question would be the lug pattern. The seller told me it was 5x5 but I didnt get the chance to measure to make sure. I was under the impression that camaros come 5x4.5 or 5x4.75 is this right?