[iva bigan]

Slowly
Can you cut an access hole in the back wall of the cabin to remove the caliper bolts? If not then you will need to remove the diff and then the lower control arm and then caliper and rotor, stub axle and then dismantle the stub axle assembly so that the new bolt can be put in,The bolt you have broken is a fitted bolt and will need to be replaced with another fitted bolt,They are a knock in / tight fit bolt.

Good luck with your projects
Iva Bigan