I am the only owner of an Alfa Romeo Spider Veloce 1991. I recently bought a factory boot cover, however, it comes with several brackets, metals and clips, which I don't know how to install them.
Can someone give me a hand on it.
show a photo of what you have.
It sounds like you got the 'other' boot cover that uses an array of plastic clips along the back stainless trim.
a veloce boot cover is larger (see link below), has hard plastic wings with forks at the front (these clip over the frame, just behind the door) then it has two strong metal clips at the rear corners (these clip over the two small chrome turrets, affectionatly known as R2-D2 's), then a few snap buttons that affix inside down the B pillar area.
This version does not use those white plastic clips along the rear stainless trim.