I may be wrong but I think there's only meant to be one on the oil cooler side 
Thats what I thought before I got down to your post.. I think your right.
Gem, try searching lower front panel air intake... if there handed though, that could mean that they're unavailable for the N/S!
Someone mentioned "Slam panel" thats the panel that holds the bonnet lock, easy to remember really, its the panel that the bonnet slams against when closing...
Tom