So I've got a new to me 2006 RK that I'm wanting to put a backrest on. Got the mount kit and backrest coming, but noticed the mounting bolts with plastic keepers and nuts that should be under the seat already installed on the bike are missing and not included with the kit. Can anyone point me in the direction for getting replacements? Would prefer going to hardware store, don't specifically need HD parts. Thanks.

 

Are we talking about a rider backrest or passenger backrest/sissybar?