Sir, you have indicated that you have boxes of lustran seed plates . I recently purchased a used 2 row John Deere corn planter. After questioning the local John Deere dealership it was determined that the planter is a 24b model date of unit undeterminable . I have photo's if necessary . The planter presently has a B1-16X Lustran corn plate installed . I would like to aquire a plate for sweet corn also. My research so far has led me to look for a B11-16 or something in the B11-24 cell plate. It would also help if I knew what the numbers on the plates mean . I have ordered a owners manual perhaps that may assist me, but any information you provide would be greatly appreciated. Thank You Randy