What is this mount?

On my defender 300tdi there is what looks like a mount for something just in front of the air filter. Does anyone know what is meant to be fitted on there?
It is rectangular with a sort of cross in the middle and a hole in each corner for bolting something on. Its a standard thing I'm sure, just wondered what it's for?

:nopics:

it's for storing cake when you go green laning!

air con pump

is it the jack/bottle jack

I'll get a pic tomorrow and post it in the hope of a real answer!