Replacement parts for Kohler brand toilets are available directly from Kohler via their website, as well as at small businesses and national chains such as The Home Depot and Lowe's. See the Kohler website for venders near you.
Kohler was founded in 1873 in Wisconsin. Originally the business made farm implements, but it later expanded to include plumbing equipment, electric devices, appliances, engines and more. It currently acts as parent company to a number of businesses dealing in kitchen and bath goods, furniture and tile, engines and generators, and golf and resort destinations. The company extends over six continents and has over 50 manufacturing locations.