The At Differential is made up of components including this Diff Comp which is the most expensive.
In this schematic the "Bolt Hex 10mm" is used most often.
Parts such as the At Differential: Circlip, Ex 90mm, Ring, Set 80mm 2, Ring, Set 80mm 4, Brg, Ball Tmb208c are included in the Civic 2004 (4) 4dr Dx (ka) At Differential parts fiche.