Cadillac Series 75 Limousine
Cadillac V16 Convertible
Chevrolet Fleetmaster Convertible
Chrysler Town & Country
International KB8 (Polar Bear Ice Truck)
Note: The Polar Bear Ice version of the International KB8 counts as its own vehicle for some reason, so you'll need to get both a regular KB8 and this variant. The Polar Bear model is parked in front of the Polar Bear Ice company (duh), on Hawthorn Ave. in West Hollywood. You'll encounter this truck during "The Black Caesar" case.
Lincoln Continental Convertible
Nash La Fayette Convertible