I replaced one of my covers a couple of weeks ago. I got it painted by Wingmirrorman.co.uk for £30. Came back perfect.
To fit, you need to remove the glass, the use a screwdriver to pop 4 fixing clips. It's obvious when you pop out the mirror glass. Be careful with the glass. Genuine mirrors are £110 each. Apparently they are the same as an i8. Be extra careful when refitting. Make sure the small guides tabs are all in place by gently squeezing it to fit. I broke a couple off when fitting mine. I didn't notice them.
If you change your mind on the silver, I might be interested in buying your covers if they are silver.