Originally Posted by Kurisu_Sand
It sounds as though the speakers you were given are 6 1/2" and the stock speakers are 6"x9" You'll need a special mount plate that converts a 6x9 hole to 6.5"
and the special mounting plates can be made up with some scrap plywood. use cardboard to trace the factory speaker mounts and then put the shape onto wood. cutting the inside hole(for the new speaker) first so it wont break easily(the wood). and only a set of wires to hook up per side/speaker. very easy if you have a jigsaw and a few scraps of, say 1/2 plywood or anything close to it.