Sent you a page out of the Leaside aftermarket and it appears the 401 is an animal of its own for crown / pinion and assorted parts in the rear end. Even front / rear springs, spring shackles / bolts / pins etc are only 401. The universal joint parts are only 401. Front wheels again 401, 3 different rims but only 401 (5 inch one side ring, 5 inch two side rings, or 6 inch) Front / rear fenders / running boards 401. Ah it does share thread cap at least with S4, 40, 60. ha ha.
Where Are You From? Ottawa Ont
Do You own a car built by Durant? 1932 Dominion built 614 Sedan