I bought four inch risers for my 2003 V92C. Unfortunately the riser studs provided aren't long enough. A second sized set they sent are long enough but diameter is larger than mounting holes on triple tree. Question is....can I drill those holes out to fit the riser studs? Or am I asking for trouble? Not sure what king of metal the triple tree is made of....aluminum maybe? Not having much luck finding the stud I need.