I should point out that my car is a 2019 US-spec base model. Some things will be a little different depending on country and year. Yes, those are the side curtain airbags, made by Swedish conglomerate Autoliv. One of the guys I work with used to work at one of their plants in Mexico, making seatbelts for BMW's, among other things.
Let me know if you need a hand, neighbor. I've taken apart a couple of cars, and there wasn't anything here that was out of the ordinary. I was even pretty pleased at the thoughtful choices Mitsubishi made here and there. This is after owning several GM cars, which often make you wonder "what the **** were they thinking??"