I have used Atlas double pole, double throw snap relays with great success on an 11 degree ross cross track. For this purpose they will certainly handle the voltage. If you look at the atlas schematic you can use one pole for + and - then crisscross the wires on the second pole to get just the opposite. You will need to put this relay as a separate switch since it cannot take constant voltage on the solenoid. Atlas showed this in a booklet titled, Fun with relays.
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