Cyberface help needed

Does anybody know how to correctly add a headband.iff and a hair_headband.ff file into the game? I got it to work for Jayson Tatum I was able to add an additional hair_headband.iff to the game but I’m currently doing a custom cyberface and I’m unable to add both. I’ve been searching every bit of code to find a difference but can’t seem to find it