These are a set of high quality car seats with a nice leather covering. They are made from white leather so are pretty hard to keep clean, I understand that this owner has now removed the leather seats and replaced them with some carbon fibre ones.
You have a wide range of aftermarket front seats available but you will find it hard to get rear seats. The rears are very car specific and need to match the width and split folding seats as well as the seatbelt anchorage points. You can always get your rear seats recovered to match – or remove them altogether and get a decent ICE install instead.