There were 8 screws in 2 Set's case to fix the bracket on my vehicle. However, the Set's are different, especially in the size of the enclosed washers. To what extent can be used in addition enclosed set due to the very small washers I could not check because the screws are generally too small for our quite specific vehicle. We have the existing factory bolts used and worked out great.
The plate holder even do a very sophisticated look and are much flatter than the standard 08/15-holder, which has a comfortable integrated in my view in the vehicle appearance. Because of the material used, I am confident to need no new holder in the coming years. :)