I have sky's widening kit and plan on putting wheels spacers on in addition. I bought the wheel spacers before I bought the sky kit so I might as well use 'em. I can always take off the wheel spacers. The sky kit looks like a good product except they are too lazy to give you the proper sized dowel pins so you have to drill out the rotor to fit the oversized dowels. Which is not bad but leaves room for error if you don't have a drill press or a steady hand.