Tony Hall runs Hallco out on the A30 the western side of Salisbury. He is an ex grass track racer and specialises in XS650s. I ran one of his US import XS650 Ds back in the 90s - I still have the catalogue somewhere - it was pretty comprehensive and covered all models including frame upgrades ( very necessary ) and big bore kits. As far as I know he is still in business. Good luck.