My axle also has "80" on the flange and has the 9" ring, which was available with LSD or an air Locker. (I can get you the 9" part numbers tommorrow if that is the axle you need).

You may find good shoes at a salvage/recycle yard. Without abuse I can't believe these would ever wear out, try to do an internet salvage yard search.

these numbers are for the "9.5 inch" locking differential:

you will need:

2 MB618916 primary shoes
1 MB618914 left secondary shoe
1 MB618915 right secondary shoe

These numbers can be cross referanced at a parts store for aftermarket brands.
They cost about $18.00 US each shoe at Mitsu internet dealers over here. These are the parking brake shoes in the USA for the Generation 2 long wheel base with the 9.5 inch factory Air locker .
The Gen 2 rear axle is about 3 inches wider than the Gen 1 with drum brakes that the USA got. Different continents got different options.
These shoes are not much more expensive from the Mitsu dealer than a discount off brand parts store , plus you will know they will fit properly.