What Duncan said sounds right. Also, it looks like they only have the driver's mat. Not the rest. Because looking at the diagram:
KG4911 is just the mat for the driver. KG4900 is the full set if I'm not mistaken and discontinued.
But, it looks like they may still have the full set for the manual S2. Might be worth checking for the other models as well as they seem slightly different.
https://www.amayama.com/en/genuine-catalogs/epc/nissan-japan/stagea/wgnc34/6649-rb25det/misc/G49
Man, I'm tempted.