Well The sliding headliner bit has two pieces that stack when they go back and also can crack in between to vent. So the main cables attach to this fancy carrier that has another set of little cable on it that allow this crack to occur under certain circumstance.There are three plastic pieces that also slide into the track along with the carrier and the metal grate that rides on the track. Those plastic pieces must be in the proper location inbetween the 4 places the carrier mounts on the track and where the metal grate mounts. One of them contains sliding sort of spring that will lock in a couple locations to stop the assembly. thee are these plastic pieces that mount in the track and then the carrier slips onto them but the carrier kept coming unclipped for some reason. The rear section has a little track that this pin runs in from the carrier that pulls it out. There is a plastic stop on the end and one side had broken that off so i need to make something to asct as a stop. Also there is this plastic section of rail at the end and it is damn near impossible to put in.

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2004 e53 m54 with 6spd manual