These are much more beefy than your factory MX5 hubs because they were designed for the heavier four door RX8, but they are plug and play...they bolt right up to the MX5 because your MX5 is a shortened RX8 platform. For those racing with WIDE sticky tyres upgrade your front MX5 hubs to these factory 2009+ RX8 hubs for safety and durability. We use these on our track MX5 and so should you. Price per hub. This is the MADE IN JAPAN Genuine Factory Mazda Hub, not a knockoff.