I don't recognize those part numbers but, for a 2000, I don't think a '98 ZJ alt will work. The wiring on the back changed. If you had a current 2000 alt you could switch the connections over but it doesn't sound like that's the case.
As far as brackets go, you need XJ brackets (I know '97-'01 will work, probably earlier will too) unless you're looking to move things around, in which case you'll have to do your own research on what works and what doesn't.
If you do some searching for 136 amp alt, and 160 amp alt you'll get some results on alternators that swap in for you're year. I don't have the part numbers saved.