I didn't ask. The Grand Prix is one of my preferred "full size" rentals. We actually drive smaller cars at home, but we like the added luggage space when on vacation. My DW's car is a Grand Am, and the Grand Prix is similar so we're usually happy with this. I don't have much need for a convertible in the Florida summertime and prefer to leave the SUVs to our Chicago winters, so a nice 4-door sedan works well for us on the EA.
Last trip to Las Vegas, there were no full size cars on the aisle when we arrived and we were offered our choice from the full size aisle. If we had had only intermediate size Malibus and Grand Ams to chose from at MCO, I would have asked to do this again.
Ralph