What are all the speaker sizes of these old trucks? Looks like there is 3 in the dash, and two behind the seats if you look at the stock places. Not really interested in giant subs or upgrades above stock, other than the better speakers of today that will fit the holes. Anyone know what all the stock sizes were, or maybe somewhere sells a whole kit of half-decent speakers? I only have one wore out junker that still plays, so anything will be an upgrade for me. It's actually the only one left in the holes.