0260B4U - Stock speaks, or the premium upgrade? I don't think those cheapo paper stockers can handle more than deck power, but I guess you'll find out!
Richie - good luck fitting the 6" Pioneers in there without custom work. Most 5.25" won't even fit, it's a very odd 3 hole mounting pattern with an angled baffle. If you have the premium speakers now, you might be able to cut off the baffle and reuse it. Crutchfield doesn't even show any inventory that will fit that location. That's kind of why I decided to go with the premiums and not worry about it.