Flat Washer used on Delta or Rockwell models: 1460 33-400 33-401 33-402 33-410 33-411 33-412 33-413 33-420 33-422 33-423 33-551 36-240 36-250 46-305 24-150 24-151 24-165 33-061 33-063 33-083 33-349 33-361 33-363 33-383 33-423 33-520 33-551 33-552 36-240 36-250