discontinued Pilot Sport 2 305/30 ZR19 102Y N1

[housemouse]

Does anyone know where I can lay my hand on 2 Michelin Pilot Sport 2 305/30 ZR19 102Y N1 tyres, which have been discontinued in November 2010, Michelin now supply only N2 rating. I have tried most major suppliers/wholesalers without success.
The problem is that in order to extend my warranty, Porsche insist that all 4 tyres have the same rating and my fornt tyre are nearly new, replaced just prior to November dicontinuation. Porshe are holdng me ranson to put a complete set of new tyres with same rating, despite that Michelin have confirmed non issue, which is racket in my view.

Apreciate any help!