To go with the Upright Adjuster Bolt (Item 0566) - this is the corresponding nut - but this particular type is an exact copy of the type fitted to Gardengate Manx Norton's. the main difference from this and the more normal road model type is the Manx version is reduced in size and weight (and much prettier!), but there is no reason why you cannot fit it to road bikes - as you are not likely to find one of the road type ones available now either! As always, this is a high quality CNC machined exact copy of the original, differing only in that this type is manufactured from high tensile stainless steel - so will not rust. As a final point - the hex on this is a lovely correct fit for the Whit spanner, so if your existing nut is chewed (as so often they are), this will allow much better purchase and less slop in the restricted area that this is fitted - normally a real pain to adjust!