Take some basic measurements of approximate length and diameter of the missing bits and hit a motorcycle salvage yard. you'll find something close and with some clever figuring you can find the right bearings, bars and brakes to make it all work. Cross pollinating one front end to a different bike is part of customs 101. A commonly executed exercise, you should have success with some diligence. Inverted {USD} Paioli forks would look sweet on that bike.