My Cherokee has lots of surface rust causing many bolts underneath to either round off or break. So I'm wondering if there's a website where I can find many of the bolts that I will be needing to replace... or can I just pick up replacement bolts from a hardware store? If so is there a certain type (or grade) of bolt I should look for? Or should I just get them off another XJ?

 

The Body Bolts that you are looking for would be easiest found at a Junk Yard, i'd think.

As far as buying new, you might just have to do a Google search on "autobody bolts".

This would be a good place to start...
http://www.autobodysupplies.com/


Sorry i can't be of more help!