Wiring Raceway

Anybody know where to find the raceway parts that cover the wiring going to the rear of the cargo van?

I looked through the Fordparts.com but wasn't able to find anything.

This raceway runs along the roofline from the drivers side to the rear and wraps around the back corner to the passenger side and stops. The passenger corner side is capped off. I'm trying to find a way to extend the passenger side further forward using Fords existing parts.

I have 148" MR w/ factory cargo paneling.

Thanks