1. Avis: Avis offers a variety of convertible car models, including the Porsche Boxster, Mercedes-Benz C-Class Cabriolet, and Mini Cooper Convertible.
2. Budget: Budget offers a selection of convertible car models, such as the Ford Mustang Convertible, Volkswagen Beetle Convertible, and BMW 2 Series Convertible.
3. Europcar: Europcar has a range of convertible car models available for hire. Some options may include the Audi A5 Cabriolet, Fiat 500 Convertible, and Mercedes-Benz E-Class Cabriolet.
4. Hertz: Hertz offers customers the opportunity to rent various convertible car models, including the Toyota 86 Convertible, Mazda MX-5 Miata Convertible, and Mercedes-Benz SLK-Class Convertible.
5. Thrifty: Thrifty provides a range of convertible car models, such as the Ford Mustang Convertible, Jeep Wrangler Unlimited Sahara, and Chevrolet Camaro Convertible.
It's important to note that the availability of specific convertible models may vary depending on the location in Australia. It's advisable to check with your preferred car rental company in advance to confirm the availability of a particular convertible model and to reserve your vehicle.