Didn't mean that my links were an exact match, but a website to start looking. The third fooled me. Their link for UK and EU shipping made me think of a US dealer shipping there.
My first choice would be the implement mfg, if still around. Second choice would be a web search for the right combo pin (looks like you found it.) Third choice would be two pins: a not quite right combo pin that could be shortened on the cat 2 side and used in the cat 1 section, and when needing cat 2, a common cat 2 pin for the cat 2 side only. Fourth choice would be common cat 1 and cat 2 pins, with a sawed-off or pinned adapter bushing on the end of the cat 1 pin to fit the cat2 hole.
Bruce