I know this is an Old Thread I'm reviving, but I never really got an answer. I have looked at the FAM, there is no mention of Cab Marker Lights, they my well be a dealer installed option as mentioned before. Can someone you provide a picture of their Cab Lights for reference/

~ Craig
1958 Viking 4400
"The Book of Thor"
Read the story in the DITY
1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane