does anyone know what sizes they all are as im replacing them all in my engine. I think theres about 3 on 1 side. 1 at the back and some on the other side
they should be able to tell you when you ask for them, i did the rear one on mine a year ago and said i need a welsh plug for the rear of an 18r, then they gave me the right one.
for some reason 40mm springs to mind