Hey my Brother-in-law professionally makes and sells clip-ons for vintage Japaneese bikes (Honda, Yamaha, Suzuki) if you want to give him a call. He is located in Portland, OR, but can ship anywhere. They should be less expensive than anyone out there. Call Dan at 503-960-2265. Let him know that you found him on the XS650 Website for a discount! AWESOME Craftmanship. He is sending me a set right now.
Thanks, Nick