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The black plastic inserts that go at the base of the headlamp where the wires butt together. This is what joins the contacts in your headlight sockets to the wires coming into the headlamp from your lighting wire harness.
The headlamp conduits are what holds these and the wires in place.
The later 1929-31 headlamp buckets had the larger 13/16" I.D. socket holder in the base of the headlamp and used these A-14584-B plugs. U.S.A.
This socket has a flared shoulder at one end to hold it in place. The flared end is captivated between the inside of the headlamp bucket and the base plate that is held in place with 6 rivets. The socket protrudes inward and is what holds the headlamp socket in place that pokes out the bottom of the headlamp. You'll need a set of our A-13011-MB (screws that look like rivets) to re-install the headlamp base plate. Sold individually. U.S.A.
Larger 13/16" I.D. socket that was used from February of 1929 until the end of production.