Fin Ears and Fish Tail for cats (SOLVED-ISH?)

SeaDragonSong

Hi all! I recently found an adorable mod that has fin ears and a fish tail for cats. I looked at it and planned on using it to make "dragons", but I can't get the ears to show up in-game. Anyone else use these and have any luck? The creator doesn't have instructions on where to find the ears (since they aren't showing up in the ear section), or if they're a slider or what. Is there some other mod I need?

Here's where I found them.

https://sai1orrabbit.tumblr.com/post/180828693911/ts4-fin-ears-and-fish-tails-for-cats-maxis-match

EDIT; I should note that the tail shows up fine! Just the ears that I'm missing.

EDIT EDIT!: I found them, ish! They don't show up as an individual item in-game, rather I have to select the folded down ears and then pick a different ear type to get them to appear on the cat. But I can get the normal ears back by changing the head/something and then picking another ear type.