From my wrecked 2000 XJ8 the tweeters behind the door handles are 1.5" in diameter. The problem is they are bonded into the bracket that snaps into the handle base. I doubt it will come apart without damage.

Expect to fab the mount brackets.

When in place, it's a pretty tight package as you only have about 5/8" to work with for depth otherwise you crash into the steel door inner.



Here is a shot when it's in place.

 

The original statement was 5.25 or 6.5... Hopefully I can add some clarity.

Here is a door speaker removed from my wrecked 2000 XJ8. It should technically be sold as a 5.25" at any electronics shop. However the marketing people of the world have decided to go with a bigger is better mentality so some companies call a 5.25" speaker a 6.5". It can be confusing so depending on what brand you are looking at you'll want to know the actual sizes in your Jag.

As a standard, Speakers are measured as the useable surface of the cone like this:



Here's the dimension of the OD of the speaker. This is not the correct way to spec a speaker but it will assist in making sure the holes are placed correctly so they will bolt right in.



Here's a shot of a front and rear door panel with the factory 5.25" round 4 ohm speakers installed.

 

You could have saved yourself the effort, I already did it

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