Durant Motors Internet Forum
Our Purpose
Preserve the automobiles manufactured by the Durant Motor Company, provide enjoyment for each member with meets, tours & technical assistance.
This forum is provided by the Durant Motors Automobile Club located at durantmotors.org
Now there you go this place has parts for the 621 and 622. Just need to find such cars if they were even built or just an idea. 
1932 DURANT Model 6-21 & 6-22 71hp 199-6cyl 109wb
ELECTRICAL - Distributors, Ignition, Plugs, Wires, Tune-up
http://www.hagensautoparts.com/1932/DURANT/Model+6-21+%26+6-22+71hp+199-6cyl+109wb/
Says he has parts for 24 - 32 Durants inc (27 D ?) Star from 24 to 28 as well. (No Frontenac's or Canadian D's, DeVaux, Conny's, Loco's or Flints either ha ha)
Where Are You From? Ottawa Ont
Do You own a car built by Durant? 1932 614 sedan