If you replace the plugs (and you shouldn't have to...you should have plenty of miles left on the factory ones) just use the factory replacement plug. Contrary to popular belief, there is no hp or performance gain in most cars because of a different brand of spark plug. So just use what the factory recommends. However, when you take out the factory plugs, you will more than likely find there are two different part numbers installed...one for each side of the engine. The replacements you get will all be one part number. This is normal and nothing to worry about.