I recently bought a base model '09 Ranger with the 15" tires and ugly wheels. First, does anyone know what kind of sensors are in them? The flat rectangular ones or the ones behind the valve stem? One is bad and I'd like to shop for a replacement without being gouged by a dealer. Secondly are there compatibility issues when replacing those wheels? Will any 5 lug 15" wheel fit or does it have to be specific to Ford or....?