You are purchasing one reproduction two wire late style (“tall style”) horn button assembly OEM# 70800-26A and wire OEM# 70131-51A,.  This was used from 1955 to  1957 and was referenced as a “retro-fit” to 1948.  Used on Panhead, Servicar, WL, and singles with electric horns in the 1954 parts catalog.  Please check your reference material to make sure this is what you need.  

Wires are 31" green with white tracer and 31" black with white tracer as original.  Please double check what length you need.  1958-1964 Duo-Glides had a 31" green wire and a 37" black wire.  We sell those on another listing as well as XLCH mag buttons, horn wires, and Electra-Glide starter and horn buttons.

We also sell correct starter and horn buttons for early Electra-Glide models and K-Model and early Sportsters.  Comes with one crimp type flag terminal and one #10 crimp type ring terminal.

The two wire button came into use due to rubber mounts on the horn and fork with the bugle or jubilee style horn.

I do have the single wire version with the short button assembly for earlier models on another listing in my eBay store along with hundreds of other restoration parts and hardware for your vintage Harley.  We also build some of the most highly-detailed restoration-correct wiring harness kits for 1915-1969 Harleys in our shop here in beautiful Cimarron, New Mexico, USA.

Used on the following (to the best of my knowledge):