This shows a rectangular cut away section directly below the sump.
I have found a couple of clearer photos of the sump guard on the Mantec site. Go to
http://www.mantec.co.uk/productdetail.cfm?theProductID=E92AF85F-15C5-F4C0-992AA4BD3EFA0258
pick on the Freelander photo then the 3 photos show the 2 variations of the sump guard.
Photo 1 and 2 show NAS spec
Photo 3 UK spec.
There appears to be also 2 versions of the exhaust guard also. One version had additional round holes in the guard at the outer ends.
But both had 5 vertical slots.
Both types being used on the 2003 event.
The Mantec site shows the version without the round holes being prototype fitted to a FL1.