Yup. I understand Menani is no longer in business. eBay seller valtermotousa sold me a pair of NOS Menani clip-ons for my Corsa Record project last fall. He said Menani was permanently closed, that they had purchased all remaining Menani inventory and were selling it. There would be no more.
There may be a chance that valtermotousa (via their website or eBay) have the adapters mentioned by Turin, but ? Good luck.