My rears are a 5x7 might double check yours.
To fit a modern 6.5 speaker in the doors you will have to grind out 1/4" around the speaker hole. I run Hertz brand in my Bronco.
Honestly any major "name Brand" speaker you buy and spend more then $100 will sound good. I think my Hertz Door speakers were $250 for the pair.
My advice, check out you local car audio shop and see what they recommend. My local shop has the display set up so you can listen to what your about to buy.