Item is sold in a package containing everything shown. This full Allis Chalmers cylinder kit will fit many models. Item is New Old Stock meaning the parts are old from shelf life but are unused and should work as good as new. It is preferred you check it fits your machinery before you order, if the part does not fit we do accept returns. The piston crown measures around 3.415” and is stamped 4515116-2. The piston housing seems to read 4515774 SPC.