No clue, but I would contact Magnetman on the other jeep forum. If you go to the monstaliner website (his signature) look up chassis saver there is a lot of info.
monstaliner - JeepForum.com - Threads Tagged with monstaliner
Magnetman is a jeeper and a great dude from what I can tell. He would be able to point you in the right direction. Rust is what his company cut their teeth on.
Tell him Squirrel442 referred you. He doesn't know me from Adam, but like many other jeepers, I purchased his monstaliner based on his support to us jeep guys.
It would be good for him to know that his good reputation is paying off.
Best of luck