I don't know about the repairing cost. But i suppose buying a use alternator will be much cheaper and better solution.
Localised material will not last as long as original materials from Japan, sad to say that.
I'm helping friend of mine to share his bad experience here who had been scammed by this muthafucka last week lost of RM1900. And today that damn guy disguise another nick in mudah.my, 0174504079 wan93. Hope friends...