per: standard catalog of Chrysler 1914-2000

9409xxx (7-digits) is closest to the VIN format for Canadian-built cars, but doesn't fall into '37 or '38

1937 Dodge
D6
9318226-9319000
9387361-9388420
D7
9469961-9478110

1937 Plymouth
P3
9376676-9381157
P4
9339691-9349561

1938 Dodge
D9
9388426-9390904
D10
9478116-9486415

1938 Plymouth
P5
9381161-9385097
P6
9349566-9358622