Hi and welcome to TeamCapri!
The Capri is front wheel drive, so there's no axles or half-shafts back there.
There is an undriven spindle, bolted to a strut and supported by two lateral links and a trailing arm. I'd suspect that these components will all need replacing. The rear subframe where the two lateral links bolt might need to be checked but I wouldn't bet that is damaged
Not sure if I'd trust the spindle to be re-used, the caliper maybe. You could try running it as-is after replacing the other bits.
You can grab these parts from any other 91-94 Capri, they're all rear disk brakes and no variations in design (except for the 94 turbo model, but these are very rare) The only other direct fit items would come from an 88/89 Mazda 323 turbo sedan, but these are extremely rare as well. You may be able to use the links from a 88/89 323 base model, but they have drum rear brakes.
Some of the parts are available new, try Russ @ Roo-sport or research the Mazda compatibilities.
Hope this helps!
For reference here is a capri rear end ("axle") removed from the vehicle, sans the subframe
