This is a carburetor adapter for the Kawasaki FE290 and FE350 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  19mm or 22mm 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 24mm 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.