MSD-322 Missile Rack

The Behring MSD-322 "Marsden" Missile Rack is a size 3 missile rack that is able to carry two size 2 missiles.

In-game description
"Behring’s MSD-322 'Marsden' is a complete ordnance storage and deployment system that can be mounted on any compatible size 3 hardpoint for the reliable and effective launch of two S2 missiles."