are you sure thats the correct craftsman number? the diagram shows it using a 12k02 engine which is a 6hp push mower engine, of course sears can mess stuff up.
anyhow, you'll need the engine's model number to get the number you need it should be stamped on the valve cover on the engine. type that model number into PartsTree, Jacks small engines or shop.briggsandstratton.com, and you'll be shown diagrams for different parts of that engine. occasionally the same model engine may use 2 different brands of carburetors, (usually Nikki or Walbro) so be sure what brand the carb is, the mfg'r name is usually stamped right above the float bowl into the carb casting.