Hinge cover for UPVC french doors

Where does one get replacements for those white flimsy-plastic covers they fit over the hinges of UPVC french doors? They never seem to be made of UV-resistant material, and invariably go brittle and fall to bits. They must cost virtually nothing, but I've not seen them available from any of the usual suspects.
Richard. http://www.rtrussell.co.uk / To reply by email change 'news' to my forename.
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