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This is a set of SIX HO scale rear light clusters commonly used by Southern Pacific and seen on many modern locomotives with ex-SP lineage. The clusters are perfectly flat to fit tunnel motors.
To install light cluster, soak in Bestine for at least 1 hour to fully remove all wax support material. Adjust mating surfaces for a snug fit. A cutout on the back side for a 1206 SMD LED is provided, simply install 1.8 mm (.070") fiber optic in the tubes for a lighted gyralite or MV lens (600-603) for a non-lighted installation.