You want: a regular #Ethernet MAU to plug into an AUI port
You have: a MAU that only works with Apple's weird AAUI port
No problem! Here's an adaptor.
@stepleton
I don't have a MAU, but as a cat-type being, I feel the duty to obtain some

@stepleton Whoa, Farallon…! something something a name I've not heard in a…

brb, checking eBay to see if anyone's selling PhoneNet adapters

@stepleton damn that's a really neat trick, just surface mounting that DB-something wire terminal :D
@fxk8y Kicad even has a footprint for it, "Connector_Dsub:DSUB-15_Pins_EdgeMount_P2.77mm". The solder-cup style connector fits around a regular-thickness PCB quite well. The Floppy Emu disk drive emulator uses the same trick (on older versions at least), and Tektronix did it with GPIB connectors in the '80s.