Hello Jakevandee, For all four door speakers use harness 72-5602
This is how it looks.
For the 6x9 speakers in the rear use harness 72-5600
The speaker in the dash I just left the oem one it actually sounds good.
I have infinity speakers all around.
I think it would look good if you dechrome it.
Would it be something you can reverse if you don't like it?
If you leave the grill chrome I would also leave the door handle chrome too.
See if this is what you're looking for.
https://www.ebay.com/itm/2007-Ford-Fusion-Mercury-Milan-Lincoln-MKZ-Service-Repair-Manual-Volume-1/233343299699?hash=item3654583073:g:29sAAOSwC1tdf56z
All I can say is it really isn't much you would have to grind. If you can try taking pics of what you have done and the puddle lights you got to see if I can be of more help.
It is just that bubble area in the passenger side you make that hole and then put in the puddle light look through the hole and check what is not letting it flush and grind it.