you can recon them by replacing the bushes, but stilll have the labour implications because you still have to remove it, better off getting a recon exchange as you can do the job in one hit then otherwise your waiting for it to be repaired, £250 is about right if including labour
90414 ALTERNATOR-70AMP G4 1.4 / 1.6 AHW/AKQ/APE/ATN Engs. 97> £118
90417 ALTERNATOR-90AMP G4 1.9 SDi/TDi 90/110 BHP AGP/AGR/AHF/AHF Engs. 97> £127 Add
90418 ALTERNATOR-120amp G4 1.9 SDi/TDi 90/110 AGP/AGR/AHF/ALH Engs. 97> £125
from GSF VAT needs adding to this price