1|This windshield washer cap cover will help give the underhood area of your S550 some much needed appearance upgrades. This cap cover is made from T-6061 billet aluminum and has a clear anodized finish with a pony logo and "Washer Fluid Only" black engraved text. As an officially Ford licensed product, this cap cover has a motorsports-inspired design and fits easily directly on top of your current washer cap!