tipper front hub caps?

[emilyjudy]

Can anyone steer me in the right direction with front wheel caps?

I have the twin wheel tipper MK6 which on the front wheels only has the 7 or 8" round cap in the centre of the wheel, I had one knicked a few days ago so bought a new one only to find out they no longer come with the steel retaining ring that holds them on the wheel. And they are no longer available to order from Ford!
Anyone found a solution to this?