Battlecorals thought they might have them and were also going to check with Germany but I haven't heard back from him after I told him that Marine Depot thought the system was discontinued 9 years ago. So...maybe?
As far as the MJ, part of my problem is that there's an after-market impeller in it - it's a needle wheel rather than a standard prop so even if I could get it I'd need to track down a different impeller.
I've basically arrived at the point that I just need to suck it up and buy a new skimmer