Custom Ballast systems?

Forgive my "newbie" status, but who makes custom inboard ski board ballast systems? Does anyone make systems for older Mastercrafts (87 Prostar 190)? I would like to have a system that allows for skiing and wakeboarding in the same day without as much manual stuff. (Of course I will do what I have to do)..

http://www.rivalindustry.com/

Many people install there own system. It depends on the amount of realistate that you have in the boat. Most people put a sack on each side of the engine, and one up front. Impellar or aerator pumps are typically used. Do a search, there are tons of threads on this subject.

check out this article
http://www.wakeworld.com/Articles/2001/BallastSystem1.asp