Well, After three hours of bashing my head against a wall, I give up. I thought I found the correct model and the two face textures but when I try to use that tool to replace one with the other it just gives me an error about an invalid hex string. I have no idea what I did wrong, if anything, and overall spending hours being perpetually confused trying to learn this to only change one small detail just isn't worth it. If someone with a clue about what they're doing wants to try their hand at this I'd be grateful, but I'm throwing in the towel.