Well, as often happens, I answered my own question!

I found the correct driver at this site:

http://support.proxim.com

Or, more specifically:

http://proximtechnicalservice.com/support/farallon/cards/download/59xv23.sit.hqx

Here's the interesting thing: Despite what the above site claims, this driver works fine under System 7.1, and not just 7.5.5 or up (as stated). Good to know, eh?

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Huxley