Checking google pictures of Durant's the rounded edge ones are 1930 and 31
Depending on hub size on the screw on cap with Durnat across it can be 28 / 29 but 1930 with bigger hub opening.
Where Are You From? Ottawa Ontario Canada
Do You own a car built by Durant? 1932 614 sedan made by Dominion Motors
This is from durantcars on the 6-70, still available on wayback site . Note two sized caps US versus Can smaller. The brochure on the 70 indicates rounded edged caps not dished.
Where Are You From? Ottawa Ontario Canada
Do You own a car built by Durant? 1932 614 sedan made by Dominion Motors