This seat is a custom tall comfort seat that was on my 2005 Adventure its superbly comfortable compared to the standard seat couple of marks but in great condition £120 + postage
Not without modifications.
The normal GS has 2 separate seats, the GSA has one long seat for rider and passenger.
It can be done but not without other work. A few swap the GSA one for GS seats too.
Question, answered well by Udders. The title didn't mention Adventure, so I became interested I wasn't sure whether it would be suitable for a standard GS., if it had, I would have had it