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#2
Scion dealer or junk yard.
Another alternative would be to check with a stereo shop. If they don't have the actual metal brackets they could sell you a radio installation kit that should have a plastic version of the brackets in the kit.
Another alternative would be to check with a stereo shop. If they don't have the actual metal brackets they could sell you a radio installation kit that should have a plastic version of the brackets in the kit.