This is a carburetor adapter for the Kawasaki FE290 engines as found on Club Car golf carts, EZGO golf carts, Kawasaki Mule, and John Deere Gators between the years 1992-2005. You can fit either a Mikuni or Nibbi  24mm carburetor with the flange mount. The cheapo Mikuni copies also fit as well, but are not recommended as they run like hot trash. These have a 26mm bore and come with studs for the head as well as pre-installed studs for the carburetor, as well as 2 M6 nuts (your carburetor should come with 2 additional nuts). These also come with an O-Ring gasket similar to what comes on the flange mount carburetors. Replacement orings will be available to purchase.