I have a Brother pq1500 (nouvelle) machine and ordered this foot from Sewing Machine Plus. It's worked fine:
1 Janome Open-Toe Darning Foot Fits Most High Shank Models (200337005)j-200337005 $29.99 $29.99
Brother Nouvelle 1500s
Janome Open-Toe Darning Foot Fits Most High Shank Models (200337005)