So this might be a stupid question but I have a 2000 Cherokee... I have 2 speakers I used to have in my other Jeep in the back. I'm going to put them into this one now. Can I put them into the door speaker spots? Do the same speakers fit for all 4 spots? Like I said, probably a dumb question but I'm just checking.

 

As long as the speakers are 5.25" or 6.5", they should fit, though you'll have to re-drill the speaker screw holes for the 6.5" speakers. You should've also taken the wiring harness adapters with the aftermarket speakers if you don't want to splice into the factory speaker wiring. You won't have to do anything to the front door speaker grilles.

Hope this helps.