Uboat.net shows 807 as gray and associates 582 with this emblem
But by looking at this black and white photo of the 807 it's hard to say, it could of been dark red i guess
doesn't seem to be much info out there on it.
http://www.uboataces.com/ref-insignia46.shtmlTranslated from the U-Historia page
"We recently discovered , thanks to the collaboration of Dr.Axel Niestlé ( and ubootwaffe.net forum ) , the emblem initially attributed to U582 (pictured right) and listed as such in the book " Emblems of U -Boat World War II " by Georg Högel , really corresponds to U84 . Specifically to a post- June 1943 period. The Dr.Niestlé to analyze the image that was available in your tab uboot determined that the same was not the U582 ( VIIC ) unless the U84 (VIIb type) . Also Axel himself has not been informed of the U552 images now appear on our tab. Since U- Story would like to thank once again Dr.Axel Niestlé its collaboration with U -History ."