Hey I'm pretty sure I bought the same files as you! But I ran into an issue with the neck seal. The rim and the overall thickness of the piece is too thin and I did manage to get 4 small magnet holes to keep it attached but the magnets aren't strong enough to hold the weight of the rear up so it keeps falling off. And I can't use bigger, stronger ones because there's no space with the thin trim. I'd appreciate it if let me know how you end up connecting it, it might help me a ton!
Edit: I fixed this issue, guess what I did? Just added more magnets......who would've guessed! Nah fr tho I thought I didn't have enough space to fit more magnets along the rim but I did. Silly me, but hey at least that's that problem solved.