shoulder bolts ? original bolts ? original drop-outs ? looks like you have shorter and longer bolts , i think the longer ones should go in front and swing with the wheel , the bolts should go the other way around and deeper to pivot on the shoulder(no thread) part , to leave threads sticking out the inside of the fork .. just a guess tho .. thats how i would do it ... if you go with washers, use some in a weaker material than steal .. aluminum/copper/brass/ (nylon or composite) is best imo