You can use the passenger peg, it just doesn't have the spring return until you can get a new one ordered. I had an issue with finding a handlebar replacement. I was able to buy a piece of 7/8 4130 chromoly at Aircraft Spruce Co. (ordered 2ft and got it delivered for about $12) and use parts of the old to weld together a new bar (I have a friend that is an awesome TIG welder..)
Hope this helps some