Stiffening assembly for a fuel tank

A stiffening assembly for a fuel tank having a wall, the assembly comprising:

• first and second inserts for the wall of a fuel tank, the inserts each comprising a base having flange, a head, and a neck coupling the base to the head, the neck having a portion that is narrower than at least a portion of the head;
• and
• an elongate body having first and second couplers at first and second openings defined at respective first and second ends of the body, each coupler including a pocket sized to receive the head of a respective one of the inserts,
• wherein the pockets are defined by a plurality of fingers, the plurality of fingers being moveable between a first state and a second state, the plurality of fingers moving radially inwardly from the first state to the second state, the first and second openings sized to cause the plurality of fingers to move to the second state as the fingers are received within the openings.