AWR2174 is the plastic bit the the screws go into but they seem to be the only screws that aren't listed, probably because they are just standard self tapping screws. The ones that hold the plenum on are DA610065L which are the large headed screws that seem to hold the entire car together, see https://www.ebay.co.uk/itm/Discovery-2-Range-Rover-P38-New-Genuine-Self-Tapping-Screw-Pack-of-5-DA610065L-/112504795164

Hi, and thanks Gilbertd, I think that I will order a few of these, simply because, as you say, they seem to be everywhere in the car. I did the rear boot seal recently, and when stripping out all the rear compartment panels, I did notice that there were quite a lot of these screws round about in different sections.

Pierre3.