You may now set left and right items in the config.yml. Custom model data, lore, name, type are all configurable.
Code (Text):
# The item to display in the left anvil slot
# Left slot cannot use name as it is used for the anvil text
# See lang/en_gb to modify anvil text
left_slot:
type: ANVIL
model: 0
lore: []
# The item to display in the right anvil slot
# Note that this needs to be combinable with the left item for the player to be able to input the password
# This is a vanilla limitation
right_slot:
type: AIR
name: ""
model: 0
lore: []