Talked to dealer and he did not have upgrade sheets. Sent me R42 part number sheets but they are the same for both the R40 and the R42. R42 shows additional seals on the sides and the back. I assume these are the upper seals. I haven't looked at the combine yet but I assume I will need to drill holes to mount the seals. If possible does anyone have the part number for the stiffer seal. Also, since I'm in the combine are there stiffer seals for the sides.