I have two SE's with Ethernet card. One 3Com EtherLink/SE and a Novell card. Both are "sort of working". They have problems under System 7.0 with AppleTalk. I only get it working when I firts start a MacTCP connection.

I have two more cards new in a box. I bought them 15 years ago.... Still keeping them for my next SE's....

One 3Com EtherLink/SE and a DaynaPORT E/SE-T