It is!Maybe a 150?
Your answer is absolutely spot on as it is a /1 variant, shame RJ21 answered first.Looks like a 150/1 to me, but definitely not a 165!
Usually those sort of lights have a black surround not yellow which is what I'm finding difficult. It's not a 37 is it?
Class 378? Open floor if I'm right
I think you're right, it looks like a bit on the side of the cab.
Class 378? Open floor if I'm right