Such a device is available from Griot's Garage.
Do a Google search, and there it is!

Randy Bergum
1990 Carat

> [Original Message]
> From: Stephen Steele <steeles@HORIZONVIEW.NET>
> To: <vanagon@GERRY.VANAGON.COM>
 > Date: 1/22/2003 2:52:52 PM
> Subject: Re: Blindspot mirrow
>
> Hey, I once saw a blindspot mirrow online via the list, was said to be
used
> by the German police.... Does anyone have the link for this, I can't find
it
> on a search engine....
>
> TRY... "mirror" ...
> : )
> --
> Stephen
>