We've made it easy!  Just visit the Accessories Page and select your machine from the "works with" drop down list.  Then the website will show you all the accessorries that will work with your machine.
OR the machine letter codes for accessories can be found in the online accessory catalog, which can be accessed at the bottom of the Accessories Page.  Find the letter code (A-K) that represents your machine from the list and use it to ensure you are selecting the correct bobbins for your machine.