go on google, you will find it, esspecially on vl turbo forums..
but the easiest way to do it. is unbolt your blow off valve, get that gasket and trace it onto a drink can then cut it out, then bolt up your blow off valve back to how it was.. only put that small bit of tin between the gasket and the blow off valve.. thats the way i done it, and occasioanly when i get bored i change it around.