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This is a set of TWELVE N scale full 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 0805 SMD LED is provided, simply install 1 mm (.040") fiber optic in the tubes for a lighted gyralite or MV lens (700-701) for a non-lighted installation.