Thanks - the more I look the greater the challenge. I have seen after market replacement shells on eBay in the US - something like £250-300 when postage is factored in, which doesn't seem so bad when comparing to the two used units on eBay UK currently. Slightly confused over import duty though... eBay says it's added at checkout, though there doesn't seem to be any (other than £30 postage). Very tempted to give these a go as it will dramatically improve the appearance of the car ....