astra rear brakes question

[kyl3_l]

have got a nova disc beam that needs spruced up and the hub/disc/handbrake shoes etc seem to be as one unit.
i take its it off some sort of astra? mk?
do you buy it new as a unit or can you buy it in different parts and it comes apart some how, i may just be looking at it wrong :tard:

thanks

[blue_peg_16v]

it all comes apart so pads discs and shoes bearings etc can be bought seperatly