Ventline's were used on the older coaches. I found my 286 does not have Ventline's. Don't quote me on this, but I think it's the "Jensen New Style". The best way is to take an old cover with you to the dealer so they can match it up. If it's broken, the part you especially need to take is the hinge mechanism for the lid (not the lift track). That's where they differ from one another.
Jon