[itslow]

To add further detail, the '33 and '34 commercial grilles are unique to the respective years. There are slight differences in stamped features in the areas where trim is applied to the shells surrounding the radiator cap.

So, to reiterate:

1932 commercial = 1932 only, but can be substituted with passenger grill shell+insert

1933 commercial = Year unique grille shell (and hood sides)
1934 commercial = Year unique grille shell (and hood sides)

1933 and 1934 commercial pieces are individually interchangeable, however.