Greetings, I am gathering approved 337's for seaplane doors and any photos or details that I can find for a run at the FAA to add seaplane doors to my Maule. If you have or know of any field approvals for seaplane doors, I would like very much to get copies from you. A heartfelt Thank You to several members here who have generously provided me with there copies. I have received several copies of the same 337's. That's to be expected in a community that shares documents and tries to help each other out. I now have two distinct 337's. Both from Maule Mod's LLC. One for an M-5 235C dated 04/19/2004. The other for an MXT 7-180 dated 11/05/2008. If you have or know of other approved seaplane door field approvals, I would sure like to hear from you. Thanks and Regards, Ed Hale Brawley Ca.