The plastic rear trim to this strap is a juggle, but will fit back in with a strong grip. Otherwise sounds like you may need to remove the roof panel. Air vents and lights first, then handles. Offside post panel has heater / ac ducting attached to the roof. Plus rear side panels etc you will need a full set of various clip fixings to reinstall. Hands in the rear light and give a very strong pull, snaps most of the clips, work back to front, you may just get away with the rear 3-4 feet. If you do take the whole roof down including over front seats. Consider what wiring you may like to install, as in lights, speakers, solar roof panel, fan, etc etc.
Good luck.
Last, if you remove the side rear panels, the safety belt harness, through the panel is a nightmare to re fit the bolts. After a lot of thought, cable tied the retainer as tight as possible, over the top and sideways to it's mounting, then the panel back and hopefully will be able to re insert the bolts
Good luck
