Hub Bolt Centre Caps?

I'm looking for something I don't even know the name of, can you guys help?

Basically I'm getting some nice new tyres on my nice new sprayed-silver steelies tomorrow. I pulled the wheeltrims off the old wheels and discovered that the small cap in the centre of the wheel, covering the bolt (For the hub/disk/drum?) is missing on the front two wheels. I have them on the back two but on the front ones the bolt and locking split pin is exposed.

I'm assuming I can find some on t'internet and I'd like some nice black ones to offset the silver but what the hell are they called! Also if I can find universal ones, does anyone know how big the Micra ones are?

Cheers guys!
 
Well for anyone interested, "Wheel Grease Caps" seem to be the most common term for them. If no-one knows the size I'll knock one off the rear tomorrow, measure it and report back.
 
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