Converting a v1.39 Mod to v1.40

[TheRanger2604]

Hi there truckers;

Just a short question here (if already posted sorry, didn't found it yet) - how am I able to convert a v1.39 Mod to v1.40?
Editing of the manifest wasn't that of a problem, but I'm not able to make the new light system appear correctly on my truck... Does simple copy&pasting of the lights from a base SCS Truck works out? Or is it little more difficult?
Everything works, the Truck appears, but only the lights are looking not good.

Would be glad if anyone could give me a hint ^^

Greetings