I´m not familiar with Nubus PC cards, but did you try the waybackmachine?

http://web.archive.org/web/20000815224254/http://www.orangemicro.com/updates.html

Small files are usually well preserved from vanished sites, some basic files seem to be still there, nb application disk and Win95 boot disk - does that sound about right?

Good luck!

Such a shame the math coprocessor is missing!