Please note that the box, and possibly the sticker, will have 39-46 printed on them. After production started, it was found that 1939 is a one year fender. In 1939, the bed for this truck was approximately 2″ narrower than from 40-46. The 1939 fenders were the same shape as the 40-46 fenders but were approximately 2″ wider. The aftermarket bedsides that are currently being made cover 39-46, so these fenders will bolt to them. The aftermarket running boards are also 39-46 and will bolt to these fenders.