It looks like you've misread the parts book Ted, 61303 is the earthing mount that holds the indicator stem in place and 61304 is the small top hat washers that the headlight mounting screws go through.
Trigger used to do the later in Stainless Steel as he sent me some a couple of years ago, whether he still sells them I couldn't say, depends on stock levels and whether he made a few that he's not sold.