As the owner of several older motorcycles, and pretty much being mechanically inclined, Suters has been invaluable to me. Sam, who is pretty much in charge of the bone yard side of Sutter's, knows most every part of every bike you could think of, or that matters at least...
They keep parts in stock that are hard to find TODAY ( let's be realistic, ever since the Internet came about nothing is hard to find if your little balls have dropped and you can patiently wait for it) and can cut you any gasket you need while you wait.
The only negative thing is that most of the bikes in the yard have been picked clean, probably by Sam himself, but that's how he makes his money, for what he has in his barn the prices are very fair, a $45 seat from a 33 year old cycle wont be taped up or missing half a hinge.