I asked the same question a little while ago and I think it was sheepdog who recommended getting Calif Stone bars. I did the swap and thought those bars were a BIG improvement. I bought the bars new from MG Cycle, they were not cheap, the bars are an unusual size as you noted, the necked down section for the controls at 7/8", the older normal size used in Japan bikes and others (not BMW). I've since sold my CalVin and the new owner might want to go back to the stock bars. BTW, the Stone bars are a bolt on replacement, no new cables or brake lines. I'll tell the new owner of your interest, so you'll be able to talk to him directly and get his input.