Yes you need one just like everyone else that has not put a steel bumper on yet. ��
Sorry to make light of your situation.
They are out there. Keep searching. Maybe check with Paul Grant (good to see you back on here Paul)
You might want to consider a aftermarket replacement or even a discovery 1 bumper modified.
I run a D1 bumper on my 2002. Looks good, tougher plastic caps and mostly steel.