Just like the listing states. The Radius 68020 board in my SE has a socket like that so do many Amiga and Atari Falcon/TT030 upgrade boards I've seen. Micromac boards also use that socket in their Mac upgrades and so did Daystar. I think the Mac II/IIfx boards have those sockets. I'm fairly certain my IIci and IIvx boards don't but I haven't looked at them in a while. I found a place in Germany that sells 68882's cheaper than ebay, but not much cheaper. Those things are like gold. :'(