The Falcon and Cortina and drum braked Commodores before 1988 were all 1420 mm track at the back. The Chrysler Centura was similar. The Nissan Pintara/Skyline are 1390 mm from wheel to wheel. Most of these had BorgWarner 78 variants which could be rewelded for the spring perches sixes ran.
A lot of work, but cheeper than shortening them. Ps. Some diffs can be shortened on only one side, and you can then save a lot of money.