Adding Rock Island "frog eyes" to u25b

I am in the process of creating a Rock Island u25b (stewart) circa late 70’s. I cannot, however, find anyone producing anything similar to the “frog eyes” Rock Island added to these units in the mid 70’s. Anyone know of suitable detail parts out there? Or have some scratchbuilding suggestions. Thanks.

For those unfamiliar with what i’m talking about, see this link.

it would help if i included the link…

http://www.railpictures.net/viewphoto.php?id=169439

http://www.railpictures.net/viewphoto.php?id=169439

It looks like a ditch light casting might work.

Detail Associates Single Ditch lights on styrene would work.

David B