https://support.apple.com/kb/DL1238?locale=en_US&viewlocale=en_US

Only 9.1 and .2 include the USB drivers, so now I'm very confused as to why they wouldn't install on my 9.0.4...  I'll upgrade and try again.

And I will do that in conjunction with the suggestions the second responder made here: http://macosx.com/threads/usb-pcmcia-card-wont-work-with-my-wallstreet-w-os9.271668/