I need the gate to open 180 degrees so I can pull into my garage / space at the side.

Two solutions here: either purchase a GateMotors Blank underground motor kit with a 180-degree adaptor (this will need your gate mounted on the rear of the pillars so that each gate can hinge all the way back); or get your blacksmith to weld the leading edges of your gates swing gates (or get him to fabricate a single gate that has the appearance of a pair of swing gates) and purchase a GateMotors Roller sliding gate kit.