These two rubber pieces are part of the 4 piece fan shroud assembly. There are 2 upper 180° bands and two lower 180° bands. The two upper bands are lapped together one directly on top of the other with the rubber sandwiched in between them. Same with the lower two bands. Once both of the "half circles" are complete they are simply bolted together at the outside flanges to form a 360° circle. This complete circle is fastened to the radiator support housing assembly directly. One of these 180° is pictured below.