EF fluent api vs db set , how do I convert DbSet<Entity> into modelbuilder.Entity<entity> ?

Hi,

I have a context class that does not use DbSets only modelbuilder.Entity, and i am removing some old class files which are used in the application. One of the classes i need to remove has the following structure below(dbset) but when i remove it i get errors because cars are used in the application but i dont know how i can give a property name as cars in    modelBuilder.Entity<MotorVehicle>();



public virtual DbSet<Entity> cars{ get; set; }