I found that if I didn't put the hyphens in the part number "200331009" when I searched, it brought up more results.
I also saw that the 1/4 inch foot as shown at
https://www.janome.com/accessories/s...nch-seam-foot/ has two holes like the one pictured, but has the additional guide.
According to
https://www.janomesewingcentre.com.a...w-foot-h-foot/ it is for 7mm wide feed dogs and that is
only for straight stitch in
Central Needle Position.
Janey - Neat people never make the exciting discoveries I do.