I can't see paying $20 for something like this. I discovered a long time ago (like 1989) that trick of switching the polarity of tip & ring on the FC-7. I keep a few of these on hand and just cut off the factory plug and solder the new one on with the tip/ring reversed. Done deal.
Please don't yell at me, I understand the desire to keep the pedal intact so that it can be used with different boards, as well as the fact that not everyone has access or skill with a soldering iron, but for me I always mount my pedals permanently to pedalboards or mark them on the bottom as to which keyboard it's wired for.
Side-note, I'm happy to wire up an adapter for anyone in the USA that wants one, for the cost of parts and a padded post-office envelope postage. Takes me like 15 min to make one. It'll just be a shorty though, my supply of free cabling is limited.
~ vonnor