Currie will build your axles to the length you need, but you'll have the option of either installing them yourself, or having Currie set up and build the rearend for you ($223 total; $124 to set up the third member, and $99 to install the third member and axles in the housing). If you do it yourself, the first thing you'll do is press the studs in with a press. I've used a nut to pull them in, but I don't really recommend that unless you're in a pinch. You'll want to make sure to order studs that will fit your brakes and wheels before proceeding. These -inch studs are three inches long, were included in the Currie axle package, and will work fine on the Street Fighter Mustang.