I hope your dad is is the Director of the "Ex Euro-spec Legal Importation" Department for Daimler-Chrysler, because there's only a handful of 2-door Gelandewagens in the US, mostly either one-off gray market imports or imported through Europa International, which was a Santa Fe, NM-based business that specialized in importing the Gelandewagen as an agent for MB before the company decided to do it directly.
Seriously, great vehicles, originally designed in the late-80's to fullfill a HUGE contract for the Shah of Iran. After the Shah was deposed in 1979, MB was left with a lot of expanded manufacturing capacity (most of it at the Steyr-Puch plant in Austria) and a vehicle designed for a now defunct military contract. MB ended up selling quite a bit of these to NATO armies, and then decided to do a quick civilian conversion that sold pretty well (and unchanged) well into the late 90's.
Parts can be sourced through any MB dealership but can be rare and as with any other MB, *expensive*.
Since they're pretty exotic, you'll either have to wheel with fellow G-wagen enthusiasts or carry a LOT of your own parts. Not worth it if you ask me...