makes a set of peg extenders for the GT, as does Verholen
. I put the Verholen 40mm (1.5") peg extenders on the day I got the GT. The SM extenders are fixed, but the Verholen extenders are two-piece with a serrated interface which allows a bit of fore-and-aft adjustment if needed. But I found that once they're set you don't really need to move them.
With those and the seat in the high position I actually had slightly more leg room than the LT. But it's much easier to drag the lowered pegs in the corners, so if you're an aggressive rider then you might want to consider that.
Verholen also makes a 60mm (2.36") adjustable passenger setup, sold through Pirates' Lair
. They would be a bit too much for the driver though, as they would scrape even more than the LT does.
You can get shifter and brake extenders, but I haven't really found them necessary. Even when I add or remove the peg extenders, I find that I adapt pretty quickly.
Other folks say that the peg extenders put your feet just a little too wide, so that pedal extenders might help them. It's really an individual call.
I have also toyed with making my own peg extenders that bolt onto the GT's frame, thus being able to keep them tucked in closer to the existing peg width. But I don't have a workable prototype yet, and that damn brake lever is in the way . . .