Does 4282 790 0300 come with the screws to mount it?

I have had a look for you and that part is only the two halves. If you need the screw (part no. 3) as well this is the one you need: https://www.lsengineers.co.uk/pan-head-self-tapping-screw-is-p4x19-stihl-part-no-9074-478-3075.html