BUMP!

if you got a bluebird h165, according to my measurements they should be wide enough to allow you to cut it down to suit a 1000
has to be wide enough as you would be resplining both axles the minimum amount possible

although i never got my hands on another bluebird h165 to try it (only had axles and drum to drum measurement)

Steve,the 1000 banjo housing(no backing plates,axles or drums)measures 1120mm

The 1200 ute banjo housing(no backing plates,axles or drums)measures 1185mm

The racing car on my avatar has a 1200 ute rear end and has 13 x7 hotwires,if you can find some other photos that should give you an idea.It also has fibreglass guard flares.

Have fun

For street use, the 1200 Ute rear axle assembly is a pain as it's just too wide to use as-is & too narrow to cut down, .... however a rear axle assembly from a series 1 or 2 Bluebird, preferably a TRX or LX could be an answer as these come with the rear discs & are cheap. They are also wide enough to cut down & allow the new splines to be machined into a part of the axle shaft that has enough 'meat' to do it.
Most axles are machined down to the minor diameter of the spline for a short distance behind the spline itself & this prevents resplining when only a small amount is removed from the width [like a 1200 Ute one down to 1000 size]

This is probably the most practical, & possibly the most cost effective means of providing a suitable H165 rear end under a 1000 chassis & with the TRX you get discs, but if drums are all that's needed, then the other models are even easier to find.

Plan 'B' could include using the original axle housing & axles, but the stronger H150 differential from a 120Y or Sunny, all in 3.9 to 1 ratio, but late Sunny wagons with the A15 engine used the 3.7 to 1 ratio.

To get this one right, you apparently need a 2mm spacer 7 a second diff gasket to align everything correctly.