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Pair of special stepped 7mm-8mm exhaust studs for SS kits (+ similar kits). On the Casa SS kits the exhaust studs threads are 8mm in size, as opposed to the usual 7mm size found on most Lambretta kits. This can cause access problems with some exhaust U-bends / manifolds due to the acute initial curve, or the fact that 8mm studs require a 13mm nut (which cannot be used on some exhausts, such as Gori's or PM Tuning pipes etc.).
These specially-made studs cure that problem. The 8mm section screws into the cylinder barrel and the 7mm section remains protruding. This allows the fitment of ANY exhaust onto the SS kits. These studs are also useful on any barrel that has had the 7mm studs threads opened out to 8mm.