Morris, It might be worth checking out Porsche 997 seats, there are a couple of pairs on ebay at the moment. See item 161177135076
They are pretty narrow, i was told 440 mm at the widest point on the seat bolster but that might not include the adjust lever.
I have not measured them in the flesh myself but requested measurements from the seller to see if they would fit in my Cabrio.
They are always in leather and around £500 a pair but quite often seem to be in as new condition.
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