Oddly, Crutchfield states (for the XJR), "No research established for this vehicle", but for the [1996] XJ6, it's stated that the door speakers are 6.5".

 

I replaced the speakers in my car, and it didn't look like anything larger than 5.25" would fit.

 

I have a 96' with the Harman Kardon Premium sound system. Just installed 6.5"s in all my doors. Depending on the speaker design they could be plug and play. If the speaker surround is set down below the speaker rim, a speaker design like that could be plug and play.

The Speakers I installed (Polk) have the surrounds just about flush level with the speaker rim, and required a ring adapter to set them back off the doors speaker opening.

It did require some additional parts and modification.

The factory speakers are 3 hole mount, but the door panel composite material can be drilled and self tapping screws used. Crutchfield has the adapters to the speaker harness, so that was a no crimp plug and play part of it.

 

I bought 5.25 speaker size too. I had to make my own holes, it was no biggie. Do the 6.5 fit nice and snug? That size seems to big for my speakers mounts.

 

They fit fine. Like I mentioned depending on the style of the speaker rim (flush or set back), is whether they can be plug and play or need depth adapters of some sort.

 

On my 1997 xj6 6.5 inch fit perfect (front and rear)

 

Yep.

Pan84, the position that you have the speaker terminals mounted, you'd have to run the wires across the speaker to exit the cutout on the other main piece of the door panel. You also don't look like to added a spacer ring, looking at your speaker style.

Without a spacer, will the speakers foam surround be vibrating/interfering up against the panel cutout when the speaker is operating? That'll wear a hole in the speaker surround over time...

 

I have spacer between speaker and panel, no the speaker membrane not touch the panel. Also I not cut anything to connect speakers