I know there is plenty of room if you have wing vents. I mounted my speakers straight into the door frame and just cut a hole in the door panel. Then I attached speaker covers to the door panel to give it a good look.

I used this to cut the hole in my door panel, it worked pretty well for a cheap tool.

http://www.guitarcenter.com/Bass-Drum-O-s-Hole-Cutter-103380416-i1137355.gc

 

I don't think canadian models had wing vents .. I've never seen one up here anyways ..

I put 5.25's in my rear access panels, in the side of the extended cab portion.. I kick my door often when I'm opening it so I'd put a boot through the speaker daily..

But there certainly is room for a 5.25 in the door itself, put the tweeter on the A pillars and the crossovers under the dash.

 

werd ^^^^^

 

I made these plywood spacers and then painted them. That way the speaker won't interfere with the window arm.

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I have that type of set up too. My speakers luckily came with a spacer probably 1/4" or 3/8" thick. Mounts in there just fine.

 

You have to watch that install with SR5 / 4 runner door panels, you lose that area of the door to a pocket.