High-performance spark plugs Premium RX, model number LKAR7ARX-11P, set of 4. - Model: Premium RX - Model Number: LKAR7ARX-11P - Quantity: Set of 4 - Type: Spark Plugs Thank you for viewing. These were installed in a LEXUS ct200h. Please check compatibility with other vehicles. They were removed after approximately 80km of driving after being installed new. Shortly after installation, there was an accident, so I removed them as it was a waste. They are used, but they are still in great condition with very little wear. New ones are a bit expensive, so why not take this opportunity to replace your plugs?