Doesn't matter what bearings you use really. Genuine normally better but they do cost more. Haven't has any issues with aftermarket bearings though.
Check out Marks Adapters for part time 4wd kits.
Part Time 4WD Conversion Kits to suit Toyota LandCruiser
The NZ agent is 4wd Upgrades on Brougham St.
You could also ask Rick from 4wd Accessories. I think he was able to get a kit from somewhere else as well.
Bookmarks