* Transmissions: The 5-speed manual and 4-speed automatic transmissions used in the 1998 Cavalier and Sunfire are interchangeable between the two models.
* Suspension: The front and rear suspension components are interchangeable between the 1998 Cavalier and Sunfire, including the control arms, springs, struts, and shocks.
* Brakes: The brake rotors, calipers, and pads are interchangeable between the 1998 Cavalier and Sunfire.
* Body parts: The body panels, including the doors, fenders, hood, and trunk, are interchangeable between the 1998 Cavalier and Sunfire.
* Interior parts: The interior trim pieces, including the seats, dashboard, and door panels, are interchangeable between the 1998 Cavalier and Sunfire.