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During the 1950's Webco sold the finned sump plate for Triumph engines and the finned valve covers too, but it was not until 1960 that the finned rocker oil manifold was produced.
The 1960 type pictured here had four fins and the name was upside down when placed on the right side of the engine. A good reason to flip your rocker boxes to run the manifold on the left. If you have the Webco float bowl extenders for Amal Monobloc's they stick out on the left as well.
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This type of Webco manifold was made for pre-unit engines as well but with a centered oil line. Not exactly sure when this type was first made, but I believe it was around the mid 1960's to replace the original 1960 version.
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This Webco manifold dates from the mid 1960's as well and is designed to clear the fins on the unit construction rocker boxes.
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Catalog listing from 1968
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Pre-unit rocker oil manifold of unknown manufacturer. Somewhat harder to find than the Webco parts. Made of alloy and larger than the Webco version that it resembles.
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Recently Identified as MCM. Made of steel.
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NOS Wassell rocker oil manifold made in the UK that will fit both unit and pre-unit engines but with some clearance problems on the splayed port dual carb heads. Submitted by Pete from San Diego.
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I believe this one from Pete's collection is a UK part as well.
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