Hans van Roadrunner engines from Velp has something to do with classics, but he is a dealer of modern engines. While fitting a new tire around an old engine, he said he had something from the distant past of his case: found a set of new piston rings for a Honda CB 450.
He will not advertise with it, but they can leave for 35 euros.
Pay attention to the part number: honda part number 13011-375-005 (old number 13011-292-000)