I have a case that used to hold my O'Connor 25-75 head, made by Innerspace. It came with the head, and I finally just bought an A&J case for the head that matches my other cases. Strictly a vanity thing... so I've put the old one up on eBay:
Just FYI. I know there's been a lot of activity with people buying heads, and if you're looking for a case, this one is in great shape; not quite "like new" but in very good condition, and there is certainly nothing wrong with it. I bet it would work with a 20-60 as well, maybe after a re-foam.
Anyway, take a look if you're in the market for a hard case for your new O'Connor.