Bernina 910 sewing machine extension table

Question

I bought a Bernina 910 sewing machine at a school surplus auction. The metal bed that came with it has the number 301 130 00 embossed on it. It doesn't seem to fit my machine. It has a sort of stirrup on the base that moves a little. I am wondering what the correct model number of the table would be and where I would get one. Bernina's website is no help.