Stock is 6x8 and Pioneer is the only one that I know of that makes a direct size for replacement. Most are 5x7's, but fit the same footprint as our 6x8's. You can put 6x9's in, but it will require some modification which I have never attempted personally. No, the price for the Pioneer's doesn't sound too bad, of course I don't know how old they are, if they are used, so on.
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