The three MacCon cards specifically for the SE were 99-00300-03, 99-00300-02 and 99-00300-04, respectively the MacCon+ SEET, MacCon+ SEE and MacCon3 for SE. The number that you have may be that of the main controller card only. It is a pity that you did not know about/get the complete assembly, including the ribbon cable and daughter card, so as to define whether you have a MacCon+ or a MacCon3 controller. If you were led to expect a BNC/AUI/RJ-45 daughter card, it may be a MacCon3 that you have.
For starters, you need to download the Asanté EtherTalk Installer v5.6.1 and to download and read the MacCon Family Installatiom Guide. The SE pages begin on 2-21.
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