I put 6.5's in front, and back. I purchased mounts from Amazon to fill the holes and as a spacer. You need to look at how deep your new speakers are, you can compare them to the stock ones. I think you will need to buy or make mounting ring for your new one you can buy them in wood or plastic. Google it you can do a search under the tacoma as well. Hear is a link to give you a idea to what you will need. I also made some mounts for the tweets using 1/8 plastic and my Dremel. Using the factory ones as the templet and just made the hold smaller because the factory tweets are so big.
2005 - 2012 Tacoma Speaker Installation Products - Tacotunes.com Shopping Cart
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2006 SR5 4x4 V6 | Toytech Coils 2"| FJ Wheels | 5100 Bilstein| 1/4 spacer| All-Pro 1.25 | 285/70/17 Duratrac | Gibson Exh |10" Sundown SA-10 sub| (2) MTX running @ 1200 watt (4) Polk 6 1/2's components| HID fogs & lows | Piaa 510 & 520 ATP | Defiant light bar | Lots of LED mod's| Odyssey PC-1500 |