The conduit that the wires go through from the radiator shell to the headlight and horn. These fit the later style 1929 headlamp buckets through the end of production in 1931. The headlamp buckets that these fit had the 13/16" I.D. socket holder that mounted inside the base of the headlamp.  The socket that stuck out of the headlamp for the conduits to attach to was about 25/32" O.D. 

Headlamp conduits are 11-1/2" long, horn conduit is 11-1/4" long.

A complete set of the conduits that come out of the radiator shell. One for the horn, and two for the headlights. 9/16" size. Ferrules included. Horn conduit is 8-1/8" long, headlamp conduits are 7-1/2" long. Conduits are stainless steel.

They fit the later style 1929 headlamp buckets through the end of production in 1931. The headlamp buckets that these fit had the 13/16" I.D. socket holder that mounted inside the base of the headlamp. The socket that stuck out of the headlamp for the conduits to attach to was about 25/32" O.D. U.S.A.