Up for sale is a set of Clear Echo Foot sizes: 3/8", 1/2" and 3/4"   and one Bernina Old Style Foot Adapter

for Bernina old style machines - 

500 Series models.....

530, 530-2, 531, 532, 532-2, 534, 540, 540-2, 542-2
600 Series models.....
600(not deco), 610, 614,640, 640-2,(will not fit Artista 640) 642-2, 644
700 Series models.....
700, 707, 708, 709, 717, 718, 719, 730, (Will not Fit 730E  Artista) 731, 732, 741, 742, 744
800 Series models.....
800, 801, 801s, 802, 802s, 803, 803s, 807, 808, 809, 810, 811, 811s, 817, 818, 819, 830, 830e, 830H, 831, 832, 840, 841, 842, 850
900 Series models..... AND ALSO FITS MODELS BETWEEN 1000-1630, 1120, 1090, 1090S

The echo feet provide a 3/8-inch interval, a1/2-inch interval, and a 3/4-inch interval.