2000 dakota speakers

before i bought my truck the previous owner cut all the speaker wire comin from the dash and stole all the speakers out of the truck, my question is what size speakers do i need for the front and back? and anywhere i could find a diagram of what wire is what?

Thanks in advance

Standard cab rear speakers are 5.25 inches . Quad cab and extended cab the speaker are 6.5 inches. There are 2 different wiring diagrams. The difference is the premium system has controls in the strg whl and an amp. Standard system is not so equipped

it has the infinity sound system in it