You didn't say what year.
Researching at cars.com, 1992 seems to be the most recent year Geo Metro with both a sedan and convertible.
(Condensed from two separate pages)
Quote:
| 1992 Geo Metro Convertible | 1992 Geo Metro Sedan | | Exterior length: 147.4" | Exterior length: 151.4" | | Exterior body width: 62.7" | Exterior body width: 62.7" | | Exterior height: 52.0" | Exterior height: 53.5" | | Wheelbase: 89.2" | Wheelbase: 93.1" |
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Even if 1992 happens to be the year in question, you'll want to research for your self. Eg. I never checked to see if they came equipped with the same tires and wheels.