Missing data library customizer endpoint for latest release

The latest release series of ICU 58.x does not show up at https://ssl.icu-project.org/datacustom/. That page only lists 57 and releases previous.

Would it be possible to update the size with a page for 58.x?

(This is blocking my ability to upgrade to ICU 58 because I depend on being able to generate a small data library using this site. I've been unable to figure out how to do it locally with a source build)