It's fine. As for the screws.....you don't need long screws because it has separate positions for supporting bases and speakers.

I got it for installation in a Seat Ibiza 2007 Mk3 (6L). The plastic is of good quality and its height is correct for the car, placing the speaker in the right spot on the door, leaving a distance from the rear window (when lowered) and from the front door plastic.

It fits well, but the space it leaves at the top for the cables to pass through could be slightly larger, because as it is now, I had to push it a little to fit it into the holes, risking breaking it.

Also, it does not include screws, so you need to get them separately because the screws that come with the speakers will be too short with the extra height that this mount provides.