i would have thought about £100-£150 for the rear axle. As lopng as its in good working order ie both wheen bearings and discs and pads are ok then thats it, just remeber you will need the glanza/gt rear brake lines to as there different to the n/a and if somebody else takes the axle off theyu will prob just cut them!!! then you will have to buy some!! As for the front depending on the age of starlet it may have the same brakes as a glanza/gt i know my sr does so just a disc and pad upgrade is the boobies!!!!