aye the m1k mouses have rather large, today, "microswitch"

electrically they are the same, but mounting could be a problem for a solid button

if you have a dumpy mouse you already rebuilt just use the closest thing you can find in a spare pc mouse and mount with epoxy putty (after soldering connections)

ps a member has some brand new old stock, maybe the wrong color tho (case swap!)

http://68kmla.org/forums/viewtopic.php?f=4&t=12084&p=117946