For engine mounts, I would highly recommend you buy the "bomb proof" mounts from MORE. Go to http://www.mountainoffroad.com/ and click on their "bomb proof motor mounts" link in their catalog. Look for the JM301 mounts a few down from the top.
They're not cheap but they have a very good reputation for holding up to anything.
I have a pair that I'm using in my CJ buildup.
I might also have some extra brackets lying around. Are you going to do A/C or do you just want the alternator? I know I have a bracket that just supports the alternator by itself. It's different than the AC brackets. I know I have an extra AC bracket but I'm not sure if I have the alternator bracket that matches it.
I'm going to be out of town for a couple of days but when I get back I'll try and figure out what I have extras for. Send me a PM so I remember to check when I get back.