Head Unit Installation in my 2002 MP5

[BlackMP5]

I am using the 88-00-9000 from Metra to install my HU this weekend (Alpine CDA-7897) and was wondering if I need to use anything else (like a 99-5512 Snap-in kit) for the top half were the radio is. If not do I need to fabricate brackets for the radio to attach to the bucket? If not what should I do?