Generator rebuilt kit 12V 30A 90 mm 356/912. With this kit you can rebuild your 912 generator. This is for the 90 mm generator. This kit can also be used to transfer your 6V 356 alternator in to 12V. Set includes 2 bearings, 1 set (2x)brushes, 2 field coils and 1 armature. There Are 2 types of Bosch 90 mm alternator. The difference is in the field coil holder. These field coils are for the short field coil holder. You can easy shorten the field coil holder with a few millimeters to fit these short field coils. Parts are also separate available. These set can be used to convert your 6 volt 356 generator to a 12 volt generator.