i just replaced my deck and am going to upgrade speakers. I know they are 6.5 in the back and I got the cover off and it looks pretty straightforward to replace. I'm on the fence if I want basic $60 speakers or go up to around $100 (that's about my limit). And if I'm doing all four at once or just the back. I was looking on crutch field and there's very few showing that will fit. Most say not compatible or "fits with bracket". I was all set to pick up a pair to install before I had to put the rear deck cover on, but most of the options I was looking at locally are showing up as not compatible on crutch field. Is it really that tricky a fit?