converting from 01ish cargo cover to 04-06 one questions

[stackz]

reading around in the articles on this. I just want to confirm some things as mine didn't come with a cover at ALL.

basically, to use the 04-06 cover in the earlier models I need to replace the top pieces that the cover would sit in right?

is there any other trim pieces that need to be replaced?? do the parts that make the cover look flush when installed come with the cover or are they separate parts as well? like there's two little trims that pop out, then you pull out the cover, and you're left with the gaping ugly "wow, they are missing pieces" holes like I have now in my 2001 x5??

where does the cover attach when its fully extended?