Best to ask Wade, but the believe he uses 49.2mm. Whereas the Suhr would have a 50mm cover for the neck. There isn't really a standardization. Over the counter covers come in 49.2mm, 50mm, 52mm, and 53mm. Dimarzio width are even different than those. You should be able to get a raw nickel cover for $10 once you validate the size, but will likely need to wax dip the cover to prevent microphonic