Kohler Highline Arc Two-Piece Toilet vs Kohler Highline Arc Extra-Tall Toilet

Both are Kohler Highline Arc two-piece elongated toilets with 1.28 GPF single-flush gravity bowls and a 12-inch rough-in, so flushing and footprint are effectively the same. The real split is height and finish: the 78305-0 is an extra-tall (comfort height) model in white with a slow-close seat included, while the Complete Solution is a standard-height unit offered in brown. Owners of Highline Arc toilets generally report reliable, low-clog flushing and easy installation; the tall bowl is the bigger comfort win for most adults and older users.

• Choose the Kohler Highline Arc Complete Solution if you want a standard-height bowl or need the brown finish to match your bathroom.
• Choose the Kohler Highline Arc Extra-Tall 78305-0 if you want a taller comfort-height bowl in white with the slow-close seat included.