By Mark Jones If you’re of a certain vintage then Manchester United versus Liverpool in the FA Cup can only mean one thing. Wembley, 1996, the height of Oasis vs Blur, lads mags, Cool Britannia and white suits at an FA Cup final. Yes, while it wasn’t quite the afternoon that Liverpool’s Spice Boys were born, it was certainly the one that secured their reputation, however deserved that was. For Sir Alex Ferguson there was no doubt. After seeing Liverpool’s players rock up to the national stadium looking like that then there was only going to be one winner. “It was ridiculous. Absolutely ridicul…