The Front Runner roof rack for the Mercedes Benz G Wagon comes in two heights and three lengths.
The standard height includes shorter legs (170 mm) that allow you to fit in tighter spaces but will obstruct the venting of your sun roof. The taller option includes longer legs (190 mm) will allow the sunroof to vent fully up but will not fit in as tight spaces.
The full length (2368mm or 93.2") spans across the entire roof, the regular length (2166mm or 85.3") goes to the front ridge of the roof, and the 3/4 length (1964mm or 77.3") is shorter to allow for some accessibility through the sun roof but does still cover some of the sun roof up and most likely won't allow you to exit the vehicle through the sun roof.
Be aware - the Front Runner rack does not generally ship with a rear ladder. We give you an option of purchasing the rack with the rear ladder which mounts to the gutter and uses 3M Dual Lock Tape to mount to the rear panel of the G.