I’m in Germany and just bought a ‘67 1600-2. In order to pass inspection, it needs all three guibos replaced. Based on the above info, I googled “SGF GA000-024”.
I bought three of them at €40 each (plus 32% tax) from E-Rubber.eu (https://e-rubber.eu/product/sgf-ga000-024-giubo-flexible-coupling/) for €172, including overnight shipping.