Bonjour Brenda, ici à Paris, il est minuit, je suis désolée pour mon anglais, ton français est parfait, si je pouvais parler aussi bien l'anglais que tu parles le français......Je suis très nouvelle sur le site, je viens de m'abonner au Quilt Show et je prends des cours sur CRAFTSY, comme ça, I emprove my english. Regarding the 97D foot, the difference is that there is a little on notch on the right side of the foot in order to fix a seam guide inside, it is as well a little wider on the left with different markings but it does not affect the stitch as it is done for a straight stitch only, in one word you have a 37 patchwork foot with a seam guide, (I have in front of me the 37, 37D and the 97D) go on Youtube for the Bernina demo. You have a 5.5 mm stitch plate the 37 is perfect, by the way there is a 37 foot with a seam guide (for the 5.5mm stitch plate) I do not remember the number of this foot, I shall check and give you the answer tomorow. Have a nice day. J'espère que tu as compris mon anglais.
Chantal