1935-1936 commercial headlight buckets are the same. 1937 commercial buckets are by them selves, Just look at the rivets that assemble the bolt plate to the headlight bucket,. 1937 buckets have the bolts further up the headlight bucket. 1935, 1936 passenger buckets are the same as each other. 1938, 1939 commercial buckets are the same as 1935-1936 passenger car buckets. 1940, and 1941 commercial buckets are similar to 1935-1936 passenger, but while the buckets form1940-1941 commercial headlights are similar, they are not the same as each other. If you don't believe this, try to put 1940 commercial headlight rims on 1941 commercial buckets. they don't fit, and vice versa with trying 1942 headlight rims on 1940 headlight buckets.