I have this machine and have all of the attachments and the bobbins. I don't think any prewound bobbins will fit this machine and I know that universal feet or a walking foot will not work. This is a class 5 Viking (Husqvarna/Viking divide their machines into 7 classes). My walking foot from my Husqvarna #1+ (class 1) and its bobbins and $129 walking foot couldn't be used on my Prelude! (I was so annoyed!) Husqvarna/Vikings need Husqvarna attchments and bobbins (mine are green and have the little H on them) and you need to make sure that you buy them for the right class of machine (it does state this on the small print of the package). Viking feet specific to your machine are also more expensive than universal ones (at least they are in Canada).