mine has 2 notch's cut into the back of the lid and the back of the seat has 2 tabs that come out and hook into the notch's... Also I believe they get anchored at the bottom also
In addition to the two upper "hooks", there are two "tabs" on the bottom of the cushion that are secured to the lid with two round head machine screws. Gar Williams
heres what they look like
the two tabs at the top go into slots on the lid
and the two tabs at the bottom are screwed to the decklid with a round head bolt and washer
the last picture shows the tab in the rumble lid but its broken
it just shows how it looks
tom