You need to get a Burton 3d disk for your bindings. I am assuming its not a channel board. You can get a disk at your local shop or just call Burton and have them send you some.
You have to get the discs from the binding manufacturer. Given the bindings you're working with, I doubt they have conversion discs. I'd recomend new bindings regardless, pretty much anything from a major brand will be a huge step up in comfort and quality.and those discs will fit my 5150 bindings?