I also bought one of the rear disc brake conversion kits.
There were a few "head scratching" moments, the caliper mounting plates had the mounting holes in marginally the wrong position and the central axle shaft hole was slightly too small, both easily corrected.
The biggest oddity was that when the spacer was bolted up the OE bearing retaining plate flexed and bent out of true!
After much digging around a pair of thin spacers were found inside the tube and once they were removed everything bolted up cleanly. No idea what the spacers are or what they were in there for and can find no reference to them in any manual. They also look distinctly home made! Not a problem with the conversion kit just something that needed removing from the OE axle.
Anyway, it all worked out fine and everything fits great.
Now to dismantle everything and paint the mounting hardware black. Also considering whether to paint the calipers?
More to come.