Sew Extreme, this might help.
http://www.clotilde.com/pages/which_foot.html
Once you FMQ with the 301, you won't go back. The bobbin sitting vertically feeds with no turns, so there are fewer chances for 'birdnests' on the back. I bought my quilting foot from April1930s shop.
Chergram, April and her husband specialize in FWs. Sew Classic has parts available, too.