The part I did find was: Britpat DA 5625
" Reduce damage to your 90! Made from high-grade polished aluminum, this transmission guard protects your 90's
gear box and cross members from snagging and reduces damage to your vehicle. Bolts on and is easy to fit and
importantly it is also easy to remove when your vehicle needs servicing. Fits pre-Td5 or can be fitted to Td5 with
centre exhaust removed and pipe fitted."
Seemed a pretty sensible bit of kit to me, hence the interest. There is a pic of the item in their pdf catalogue but I can seem to copy and paste it here.