[Alex van de Wetering]

Jacek,

You're making good progress!

The rear lights are not original to the truck. Original rear lights would have been Rubbolite-style lights (lights with rubber housing). Early trucks only had two of these on the right hand side.

I don't know about regulations in Poland; but you will likely need some modern lights to be able to use your truck on the road. The "French" light, although not original; does look very "period" and might be good to keep for that reason.

Alex