The problem with some Kenmores is they used special buttonholers and monogrammers that ran on a little gear in the bed of the machine. I have no idea how to tell which of those will work if that's the case with yours. If you have the manual for your machine you might get lucky and find part numbers for the accessories you want.
Macybaby is our resident expert on feet and attachments.
I know I sometimes struggle with recognizing which feet fit which machine too. One example is I have an old National made machine that uses top clamp feet. Be happy yours uses side clamp feet. IIRC Macybaby has identified around a dozen different sizes of top clamp feet. The width of the attachment slot is the same as for a White but the needle hole is closer. It's very hard to tell from pictures which are the correct feet and the boxes usually just say "Attachments".
Rodney
So far I think I've seen mostly White Rotary feet. Not buying right now, just trying to learn for when the time comes.