Need help selecting switches

hello gang,

I purchased an sd2iec from a guy in poland.  The thing works well.  But, I can't swap disks.  I found out other people had this capability on theirs...but why didn't mine?  I reached out to this guy and get sent me a picture of the board and that there are ares for drive 1, and drive 2.  I guess I have to solder some kind of switches here, but I'm not sure what kind.  momentary? on/off? I really don't know.  Any suggestions?

Thanks!
-Tony