Take a look at this link (https://pastebin.com/u/Lewd-H).
You'll find what you want there.
But no, you don't need HS_SlotID for the game to work. What you want is the More Slot ID and MoreSlotID Resolver.
HS_SlotID was an old way of dealing with conflicts that leads to lots of incompatibilities with cards (e.g. if i share a card i made with you there is a high chance you'll miss some items because i changed ID long time ago).