If I can figure out who the original mfg of the part was (Winnebago outsources a lot of their "small parts") I will go to their site and order directly from them. As an example TriMark is the mfg of most of the locks, hinges, latches, door locks, keys for the outside compartments, etc. They have a web site and you can look up your part there and order directly from them ---- then you know you have a part that will fit. Sometimes it takes some more work to figure out who the supplier was or the supplier may be out of business or has been acquired by someone else -- whole new ballgame. This is how I have found "stuff" I need. As someone else recommended, Ebay is also a good source as are RV parts suppliers --- I have bought from Lichestein (sp) as has been suggested also -- they are very good.
Dave and Karen -- '02 Ultimate Advantage 36 C, 350 HP Cummins, Allison 3060 Tranny
'13 Ford Edge, InvisiBrake