The washer you see in the main picture is no longer manufactured and is therefore obsolete. You are looking at a replacement diaphragm washer and service kit as it shows in the other pictures.
Genuine Ideal Standard / Armitage Shanks spare parts
Repair / Renewal kit consisting of 5 components:
1. Diaphragm washer (most common part that needs replacing)
2. Small rubber 'bullet' washer
3. Blue flow restrictor
4. Internal filter
5. 1/2" internal diameter sealing washer (only needed if completely removing the valve)
Full instructions also included
YOU WILL NOT RECEIVE THE INLET VALVES, THEY ARE THERE FOR ILLUSTRATION PURPOSES
Your old washer may have a red plastic insert and bobbles around the washer. Do not panic as it's the valve that give these washers the bobbles and is probably the reason it is failing. Your new washer from this service pack will have a white plastic insert with a smooth rubber