In the case of the Tiara, Monteverdi carried over the entire drivetrain, as well as the interior, including doors and glazing of the base vehicle.

Monteverdi installed a vertical, heavily chrome-plated front grille with four round headlights.

The tail lights were the same ones from the Peugeot 505; in an attempt to create an association with the untrained observer to the recently presented Rolls-Royce Silver Spirit.

Instead of the large plastic units of the base vehicle, Monteverdi used very narrow bumpers, which were bordered in chrome and reached into the car flanks.

The Tiara featured the complete range of equipment found in the S Class, including air conditioning and some of its state-of-the-art systems such as ABS and airbag; it could be supplemented by Monteverdi-typical attributes such as a television and voice recorder on request.