For a front wheel, get a back axel and stick old bearings some from old crappy skateboard or any other bearings you cna find, not expensive >.> For back pegs I used an alen screw and it fits in the back axel and its longer so i just stuck pegs on that. You can also use another alen screw on the front if you want to have really long pegs.
Or just get old sockets from a wrench and stick the regular axel bolt in there. But make sure its big enough.
Also experiment with washers if you want the bearing pegs to roll, or you can just loosen your wheels and the pegs will roll.