A set of Stainless Steel Crankcase Adapters that will fit the Viper, Venom and Thruxton models and may be others. The set consists of 3 long adapter (Velo part number M56/7) and one short adapter (Velo part number M56/6). The threads are the same as used on the original adapters so they will take the original cylinder studs if the threads have not been stretched. We also list the cylinder studs in stainless. Please note all stainless parts should be assembled with copa slip, 'copper slip®. All British thread data can be viewed on our web site. Any queries please phone Motalia on 08444140380 (local rate) office hours.H08x3 H14x1 These items are Made in England.