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My headrests came with inserts held in with 4 screws .... so they are the new and improved versions as per the old post ... they are heavy duty plastic and I see no way they could possibly warp ... I have no idea what the originals were made out of ..
I got mine for the $150/pair price before PMP sold out ... they only last about 1 week before they were all gone. I got in early .. think I got the 2nd set ..