I am needing to replace my speakers in my truck and not sure what sizes I need. I am getting ready to do some sound deading with b-quite and want to replace the door speakers when I do. Most of them sound bad and while I don't listen to the music much and don't need much, I do want them to not rattle when I do. I think the front are 6x8 ovals, don't know about the back doors. Thanks

EDIT: forgot to mention, truck is ext. cab with small doors