Walk Behind Lawn Mowers

My walk behind lawn Mower Husqvarna LC 121P did not come with the parts necessary to attach the handle to the body of the lawn mower. In fact, it only came with a single clip. I have been using zip ties to hold the handle on, which works poorly. I have tried to find replacement parts, but have been unsuccessful. Any suggestions where I can order the knob bolts that hold the bottom of the handle to the lawn mower? Thanks.