An essential item to completing the Kswap, either K20 or K24, is this EP3 Idler pulley. Due to the K Series engine no longer having a power steering pulley when installed in your MR2 Spyder, you need to have one of these to keep your serpetine belt on. Best of all is it is adjustable, allowing you to use many different sizes belts. Comes complete with all hardware needed for your install.