Fixing a Landrover 90 (1990) rear wiper motor?

Is it possible to fix a Landrover 90 (1990) rear wiper motor, and if so where do you get the parts? Started making a right noise before blowing a fuse, checked motor, just seemed to be one of the magnet bushes worn down. Not been working for 2 years now, but if fixable then would like a go at it.