The F-1 rocket engine's LOX dome (aka "oxidizer dome") routes high-pressure liquid oxygen (LOX) from the turbopump to the injector, where it is mixed with fuel and subsequently burned.

The LOX dome is located at the forward end of the engine, between the gimbal bearing and the injector:

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From page 1-7 of the F-1 Engine Familiarization Training Manual, located in the archives of the U.S. Space & Rocket Center. A superset of this document is also available from archive.org.
Extraction and cleanup by heroicrelics.org.

A more detailed diagram of the LOX dome itself:

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From p. 134 (p. 145 in the PDF) of Project First, F-1 Combustion Stability Program, Volume 2, Book 3.
Extraction and cleanup by heroicrelics.org.

And a photo of the LOX dome installed in F-1 engine F-114-2 at Stafford Air & Space:

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Picture by heroicrelics.org.

The only vintage picture or diagram I've been able to find of the aft-facing end of the LOX dome appears below (LOX dome located in center of the photo, in front of the thrust chamber's yellow dolly).

Taken from Saturn V Quarterly Report No. 16.
Video capture by heroicrelics.org.

F-107-1 at Science Museum Oklahoma (formerly the Omniplex) is displayed without its injector, so the aft-facing side of the LOX dome is visible:

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Picture by heroicrelics.org.

Note the 16 small-diameter holes closer to the center of dome face (alternating with the slots). These correspond with the 16 inner-dome attach bolts, which help secure the injector to the LOX dome; these bolts are also shown in the diagram above. Cylidrical sleeves with conical bases would be fitted to these holes to protect the bolts.

Thanks to Vince Wheelock for providing invaluable research and insight into the F-107-1 LOX dome issue.