i got a whole set of feet with my 6600..and one accufeed foot..i bought 2 more for her.
then when i went back to the dealer and bought the janome jem platinum for traveling..all the regular feet were interchangable! Bonus! all i had to buy,was a second 1/4", to keep and have with both machines.
make sure when you buy a 1/4" foot off the rack or on line..that you have the right one! Janome carries two different one, meaning the hole is different..one is just a hole, and one is a hole and a little more cut out to the right of the original hole.
my girlfriend went and bought the wrong 1/4" for her jem, and bent the shaft,she had the wrong one.
be sure to ask your dealer, tell them what you have and they will get you the right one. i can take a picute of the foot with the correct hole if anyone wants me to.