Yeah you could be right Ary! Done a bit more digging and found 3 part numbers now, and they are also listed on the UK parts system.
Listed for the NSX-R, BUT also on UK/Europe system is:
74650-SL0-000 £124.81 + vat
Also have: 74650-SL0-0010 £138.64 + vat and: 74650-SL0-A00 £124.81 + VAT
Was trying to look at some pics I have but hard to tell as I dont have any that really show that low down of the rear.
Maybe Mark could have a look at his Type-S and let me know.