1931 DH and 1932 DH (prior to introduction of the DL) had a few minor differences. One was the faux louvers in the radiator grille insert was changed to a simple stamping that looks like vertical slats. Another difference is the addition of a front seat adjuster. I had picked up a late 31/32 DH as a parts car for my 31 DH and noticed the differences. I believe the ram radiator cap was also introduced at that time, but I'm not sure on that. I do have the grille insert available.