Other ideas... rear trunk carpeting, frunk carpeting if it is a Bertone, access panel between the rear trunk and the engine, jack and Fiat tools (if they are still there). Not much around the engine, maybe the heat insulation on the firewall and all shields under the engine. Inside, the carpeting, the door panels upholstery, the electric windows motors (if it is a Bertone)and the top insulation if there is some (later cars). The headlamp motor (leaving the lights in the UP position). I guess you will keep the wiper motors in case of rain.
BTW, the one piece engine lid/trunk lid is available from Europe.
Did you find another one or are you still waiting for mine?