Ditch lights

60103

Pooh Bah
I bought a lighting module for my Athearn SD40-2. It has a pair of headlights and a pair of ditch lights.
Does anyone have an illustration of how to install the ditch lights? There aren't any places for them on the loco, but I bought some castings that are brass with jewels and I'm not sure if I can install these. I'm not particular about exactly where they go.
(The loco is possibly 20 years old.)
 
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