I've ordered a few FL-500S filters from Amazon (shipped and sold by Amazon) and the most recent one looks quite odd. In the pictures below, the new filter is the one on the right. Most of the pictures online of a FL-500S show the filter with the small ridges at the top of the filter (including the image on the box), however the new filter only has 14. I can't spot any other differences, is it possible Motorcraft changed the design or is this is a counterfeit? I'm planning to return this filter and buy one from the dealer for a few bucks more.