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I made mu own too, but if you dont want the fuss, my buddy bought the junky (durabrand or sorchse) 6.5 speakers at walmart that include brackets. I think it was like 8 or 9 buck a piece.
just trip out the inside of the stock adapter the actual opening will fir an 8 inch speaker. i just trimmed like 1/4 inch all around the inside with tin snips