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Just make one. Get some ply board and cut it to size and get some foam and material and cover it up. You can buy the foam and material from anywhere even walmart. $10 tops. Or just go to the junkyard with a tape measure.
+1 to what Crazy said. I'm actually going to make mine a new lid because the stealership sells them for a rediculous amount of money and mine is starting to fall apart.