Seat pan #6 is a Monroe made pan. It would have been sold with a dealer installed Monroe seat if he did not have or did not want for some reason to use his original pan. The two bolt mounting of the Monroe pan fits the same bolt spacing as the IH mad 4 bolt seat. They will not interchange with the rail mount pan off the IH bent pipe seat. So, What is your question? If you are interested in aftermarket seats take a look at some of these. All these pictures were shot at the Old Trusty show a couple years ago.