For your brake and clutch, they do make adjustable levers you can buy. google search em. Not sure if any are made for the 300 yet... maybe one for the 250 will fit? but not entirely sure. worth a shot if their not too expensive?
Also the shif lever usually has a nut on the end of its pivot point holding the lever on. or like a doorknob, the lever may fit over it like a sleeve and a hex nut on the side may hod it in place, I would have to check it tonight, I am at work right now.
But you can usually take thee lever off move it to the desired position and slide it back on its teeth. re-insert the bolt and tighten.