In the same trip to the scrap place I bought an M7792
DEUNA card. From the
DEC Field Guide it's unclear whether this card is usable by itself, or
needs a companion card M7793, to bring Ethernet connectivity to a Unibus
machine.
You also need the M7793, in addition to a DEUNA cab kit.
If you get a chance, grab the DELUA instead - it's a single-board Unibus
Ethernet adapter.
Tim.