The strut bumpers are late 1973 to 1976. Your rear axle is a 8 1/4". I'd love to find a link to order a set of those taillight lens for my 1976 Duster.
You are half right.
The OP mentioned a Dana 30. This is likely to be true. That axle is not an 8 1/4 but it looks similar. The diff cover bolt pattern is different.
Also, there are often "Local content laws" that apply to many cars that are either imported or built at plants outside of the USA. Australian cars used different components as well.
