Shoot...flank your 6x9's on a bandpass enclosure with twin 10's or 12's. Timid? Make a 12 inch inclosure for the space where third seat goes and just put 5" mids on the doors.

I've seen a pair in the tailgate, but it wasn't pretty. Plus, that route is tough because of running wires to and through the hinged tailgate.

I'd be willing to bet that they wouldn't go into the rear doors without cutting some metal to get them in deep enough. I think the factory speakers there were four inch and 5-1/4" will fit without trouble, so depth and window clearance probably isn't an issue.

Boxes are probably the easiest and least destructive way to go, but may end up getting tossed around unless they are held down. I think I'd go the box route making sure that they can be easily removed/moved when I carry passengers or have the seat down for hauling. That means extra long speaker wires with quick release connectors. With the seat up they could sit right behind the seatback (again how to keep them from floating around) and with the seat down they could sit out of the way on the floor right behind the front seats.

--Will
850 / Mini

I guess you are talking about speakers.
pass side there is a panel over the wheel well,
but the spare tire is on the other side.
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69-145-S ; 71-145-S ; 72-145-E ; 72-1800-ES ; 87-245-DL