Mounting Adapter - 4 Bolt Toilet To 2 Bolt Flange - White. With its European styling and 100 percent vitreous china construction, the Concerto toilet is perfect for motorhomes as well as fifth wheels and travel trailers. Concerto's soft lines and gracious curves belie its abundant features, including a powerful rim flushing action, elongated comfort sealand quiet operation. Sealand Universal Mounting Kit includes mounting ring, spacer ring, screws, and complete instructions. Fits all models.