What the!?i been down this road, there ain't no beer joints on it!
you have to get the whole friggin seat unless you can get one off a junked bike with a broken seat pan from somewhere and they cost a bunch!
my solution was go to hardware store buy 2 giant bolts, nuts washers, a chunk of wood ,whack some holes in the wood, stick the bolts thru, etcetcetc and get run over by a truck