Yeah...I went through about 6 months of trying to figure a good way to a comfortable seat on the Adventure...Seemed Corbin or Seargent were too expensive, and also seemed that no one made covers/foam.
So after eons of searching BRAP put me onto GUTS Racing www.gutsracing.com
They made nice covers/foams for the RX/C that happen to be the same as the Adventure seat. Give them a call.
As for me, I fianlly decided to just do it myself with a cover from Guts. I cut the seat down about 3/4", made it wider by about 2", and installed some closed cell "ensolite" in the centre portion to maintain suspension value given the cut-down. Not sure how well it will work (although I expect to get the bike out for the firt time next week), but it looks good, and is definitely more firm, wider, and on less of a forward "cant".
Here are a few pics:
See the whole process at:
The whole process only took about three shop nights. Total cost $80.00 for the cover, and an old camping pad I had laying around.