Ibstock Oldcott Rustic Bricks 65mm (Fleet Hargate PE12)

We are having a new central heating boiler installed and need to move the exhaust flue and therefore I am looking for 4x Ibstock Oldcott Rustic bricks like those in the photo. I believe this is the correct name having spent a while online looking at photos of bricks. I have tried all building suppliers in a 30 mile radius with no success. I even ordered some online but when they have arrived they are plain red faced.