the peg in your pic needs to be removed from the bracket, put into the shock eye, then nutted back onto the bracket - that end plate should prevent the shock eye from going on or off the peg, and you won't get the rubber grommet over it - the 57 should have the peg as part of the bracket [welded or swedged] with the nut on the other end so the peg can't be removed, but the nut and a flat washer are removed to get the shock eye off .... the other possibility on yours is the peg is original and part of the bracket, but the threaded end was broken off when someone tried to loosen the nut, in which case you'd need to replace it with an appropriate sized bolt
Bill
