The main purpose of these parts is to push water out to the side when driving through puddles. This is rather than throwing it over the screen which can temporarily rob the driver of forward vision.
They were fairly easy to fit and I just followed the post on the Freelander 2 forum. The only thing we did differently was to use stainless steel self tapping screws and washers for all 3 fixings on each shield. These were purchased from Stig Fasteners.
Before and after shots are below.
I’ve found then when hitting puddles at speed a lot less water seems to splash up over the windscreen now and they were well worth fitting.