As this is a Deville your limited on what will fit as well as the type of battery as it is under the rear seat cushion. Now you can get a gel cell that will have way more cranking amps than a normal battery for this car but be prepared to pay a bundle for it. If that is what you meant by size.
Any parts store can tell you what size is needed to fit properly in your Deville. Remember to purchase a battery that meets the recommended CCA rating. The decision about type (gel cell, wet cell, glass mat) is based on. where and how you drive. Gel cells and glass mat types are more vibration resistant and cannot spill. They are good in rough conditions and cost about twice as much as a wet cell battery. I suspect your Deville does not need this battery type.
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