If you're having trouble displaying the following characters install the Hanazono font.
石 毛 doesn't seem to have much of a record as far as I can tell.
No results found for “⿱石毛”.
⿱ means top/bottom components in order of: 石(top) 毛(bottom)
𥎿 日 also doesn't seem to have an exact match that I can find, but this website seems to say it's this:
they say it's a combination of
𥎿 日 but the character looks more like 干 than 于, not sure if it will work for your purpose.
How to find characters?
I used zisea's 两分 to find both characters.
For the first one I searched
羽 能 (with a space in the middle)
and for the second I searched
高 毛 (with a space in the middle).
If you can figure out the two major components you can pretty much find any character you want, unicode or non-unicode.
zdic sou suo page explains it like this:
笔顺名称 一（横） 丨（竖） 丿（撇） 丶（点） 乛（折）
笔顺编号 1 2 3 4 5
𩫁 for instance is 丶一丨フ一丨フ丨フ一ノ一一フ which equates to 41251252513115
if you search for this on zdic select 字典 and then 笔顺 you'll get something like this:
"𥎿 日" google search
If you try an exact search (quoted) for the components you are looking for you might also find what you want. That's how I found 𣉻 referenced as a combination of the two, obvious, components of your character.