You need to determine what shank fits your machine.

http://www.sewingpartsonline.com/sewing-machine-presser-feet.aspx

When you know what shank your machine uses, you can order presser feet for it.

http://www.sewingpartsonline.com/janome-hf106-sewing-machine-parts.aspx

P.S.--your Janome dealer should have what you need for your machine.