I just went back to the ads, and Rick is still selling these on here. He advertises that they are supposed to be machined, and a direct bolt on. I sent him an email with the problem that I have found. Maybe I just got a bum one that didn't get machined, who knows, but I'm going to see if he'll make things right. These are a really good price, and if needed he sells the adapter plates as well. The piece that I got from him is yellow anodized aluminum, and looks like a real nice piece minus the problem with the retainer on the piston.