The dash grill pops off. I ordered some Kicker 3.5" drivers to go in there. I was advised by Crutchfield that the speaker may rub on the grill some or may require some modifying. That's okay, once I get them in, I'll figure out a way to fab a new speaker grill, or modify the existing one.
You will need different harnesses for the 3.5" speaker. Use Metra part number 71-039C.