There are only 2 filters, that little one on the side you cleaned and the larger one on the bottom you didn't. You don't usually replace them because they're metal screen, you just clean them. Many do replace the bottom one because it has holes in it but as I said, I just repair them now.
You probably will need a new gasket for that bottom oil pan. After that, you can probably re-use it up to near half a dozen times, until it starts to leak - then replace it again. I start with new gaskets on that little side filter as well. There's 2 there, one under the filter and one for the cover. They seem to last a long, long time. Mine have been in use several years, put through multiple oil changes, and are still sealing fine. I needed to replace the bottom one once so far.
