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P2 is the minimum standard for clearance, side marker, and identification lights. All Truck-Lite lights meet this standard, even if they are marked PC, P3, etc.
PC lights are to be used as a combination light, meaning the light should be mounted on a 45° bevel at the corner of the vehicle, allowing clearance and marker functions to be combined into one light.
A PC light can always be used anywhere a P2 light would have been used, but the reverse is not true.