You can get both seatbelt styles on Amazon. I have one that fits the older designed planes and I also have one that fits the 800 series. I keep both in my carry-on all the time since I never know in advance which style planes I'll be traveling on and I fly on Southwest at least once a month. I always use my own and I have compared them to the ones on the plane. They're made by the same manufacturer as the seatbelts on the seats. Flight attendants have seen me pull out my own extender and use it. Nobody has ever said a word to me about it. Other than the one time a flight attendant discreetly complimented me for being prepared. I am losing weight and will be very excited when the time comes I won't need an extender. But until then, I'll keep bringing them. I totally understand the embarrassment of having to ask for an extender. And they only have a limited number on board. I saw them tell a guy once that they gave out all the spares. He had to wait until the safety demo was completed before the flight attendant could give hers to him. He looked mortified when she walked it back to him with everyone watching. That is why I always come prepared!
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