Need Help Finding Horizontal Bike Safety Flag (US)

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I'm looking for the kind that mounts out from the side of the bike (NOT the vertical kind.) I got no help at Bike Forum so maybe someone here can be of assistance. Thanks.

http://www.bikeforums.net/showthread.php?t=106768

I'm making my own, out of PVC pipe, double-sided velcro, & a store-bought flag.