Here is a custom shot clock with custom numbers I made for the classic team stadiums. Just import both files into your sXXX.iff file(s) that you want to use it with. Again, this is for the old classic team stadiums only. The numbers are actually transparent. There's only a black background in the image so you can see how they look.
You'll need 7-Zip to unpack the archive.
www.7-zip.org