I think it's safe to say that you're not going to be able to find a rebuild kit for your specific brakes. Again, the best option will be to move onto something else(even if you are mechanically minded and like to tinker)...
Find a used set if you can. Also, it's very likely that the brakes you have operate on DOT fluid and not mineral oil - even so, it's a better idea to use the fluid that the manufacturer recommends especially when it comes to mineral oil...DOT fluid can be picked up at your local autoparts store or even wal-mart(just get the right level).