The P411 used an alloy carrier version of the H165 in the 'rear' diff [to distinguish if from any other diff a 1200 might have]
These will bolt into the 1200 Ute rear axle housing [which is not readily available in Washington state] They will also bolt into the PB110 & PB210 Excellent rear axle housing [from which the ute rear end seems to have been derived] Unfortunately there are not readily available in the US either.

These earlier diffs use a different spline in the side gears & are a 4.11 to 1 ratio.

Simply put, the early [alloy carrier] H165 differential will not fit either the H145 or H150 axle housing & even if you had the correct housing to use it in, the 1200 axles will not plug in.

It may be possible to rebuild it with the later side gears from the [iron carrier] H165B but you will still need a suitable axle housing for it.
I also think it will not serve you too or too long well if you continue to dish out the level of abuse that you describe.