Late model Colorado or Trailblazer rear axle swap

[HackJob65]

I have been searching the site a bit without much luck. So has anyone looked much into using a late model Colorado/Canyon or Trailblazer rear end. And if so do any of you know the wms to wms dimensions. All I can accurately find is that Z71 opt is wider than a Z85. I know the bolt pattern is smaller on the Trailblazer but have no idea of the width or if there is enough material to redrill for the 6 on 5.5 pattern. This swap interest me because I currently have two old 65-69 12bolts that both need a rebuild due to rust and wear and a late model with the disc brakes can be had for around $200 at salvage yards. Any definite known info would be much appreciated to keep me from driving to several Salvege yards and spending a day measuring.