All of the H165 rear axle housings are essentially the same except for width.

The series 1 & 2 model 910 Bluebird TRX & LX cars came with disc brakes on their H165 rear ends.
You catching on? If you can come up with a disc brake rear end from a Bluebird, then you have ALL the parts you would need including a 3.9 to 1 differential if you needed such a thing, to install disc brakes on a H165 Ute rear end.
You will also need to run 14" wheels or larger as 13" simply does not fit.