Hi, ive got a couple of oversize studs if your interested, they are for busses with worn threads in the cylinder. They are if I remember rightly 8mm on one end and 9mm on the other.
I assume you tap it out to 9 mm and away you go.
I bought them for my bus but they were no good because my bus has a type 4 engine and they are longer.
Got them from C&C if I remember rightly, you can have them if it helps you out.