USED: Kids II Boppy TrueSpeed Full Size Swing Passive Restraint Part. This is the part that goes between the legs and also helps secure the tray. Don't know if it would fit the travel size swing or not.
Measures 4.25" x 5.5" at base.
Held in place by the two included screws.
Be sure to check out our other listings for part from this swing and save on combined shipping!