SKS Fender Hardware and Longer Stays kit - 27007
This is four (4) 380mm long* stays and the hardware to mount them. The tricky little bolts with the holes in them, and the nuts for them. All you need.
Now, furthermore, if you've lost your fender-stay nut and don't have an ASM to sub for it, and you have one of our bikes with an MX seat binder nut, and for some reason would rather have your seat post sink than have a loose fender, and duct tape is out of the question (as a fender stay-to-fender connection), then you could, conceivably, use your seat binder nut for the fender stay nut. Our seat binder nuts have a nyloc anti-vibration doughnut in them, though, and you'd have to pry it out of forge on through it.
kit contents list
4 - (380mm) stays
2 - secu clips
*The stays that are packaged with Longboard/Commuter fenders are 355mm, so the stays n this kit are +25mm (1") of sweet stainless goodness.