A:AnswerYes but you have to remove old speakers cut the center out of the housing mount speakers to existing mount and reinstall. Otherwise need to buy a kit to mount them
A:AnswerTo my knowledge most pathfinders have 6x9 front speakers, these could fit but wouldn’t be snug without an adapter. They’d fit if you self tapped a couple screws in though. Personally I’d recommend you get some 3 or 4 way speakers if you’re looking for a more universal ranged speaker. These are only two way so won’t have much bass or as much range.
A:AnswerThey should fit with no issue, though I believe the front door has tweeters in it originally. I’d recommend you swap out your rear speakers unless the tweeters are out.
A:AnswerThey’re the same size as your stock front speakers, they should fit with no issue. Your front speakers are 6x3/4 and your rear speakers are 6x9.
A:AnswerThey can fit in your front door but you might need a separate bracket to secure them. You could also use self tapping screws but it’d leave a less professional look and if you ever took them out you’d have the extra holes.