Badly need help (roll cage)

Hey I seen a pretty cool idea a while back in Mopar Action. A guy put a cage in a duster and ran the rear-down bars through the speaker holes in the package tray. He was able to keep the tube running toward back along the roof til' the glass then turn it down and go through the holes.
Just an idea.

Thing is I don't have a speaker tray, Its a Fastback.
I'm looking to see if the bars go down into the hatch area or if the extend into the trunk. And if they do go into the trunk how you go through the divider and still keep it.

Sorry to be a pain but I have never had a car with a roll cage before.