This guy has various ring sets listed to fit Elto, Johnson & Evinrudes as well as others. Perfect Circle & other makes. I am giving you a link to what may fit, but he has others. You can contact him. Chip is his name @ TSC sales.
The Evinrude Mate – Elto Cub has a bore of 1.125" and a stroke of 1" for a piston displacement of .994 cubic inches. Its whopping half horse power is developed at 4,000 RPM. . . 😆