Where Can I Find Replacement Black Knobs for My Bones Rack? Philip Cowles March 30, 2018 14:11 Follow Replacement rack parts, including Bones knobs, are available on our Replacement Parts page. Related articles I Need to Replace the Top Hold-Downs on My Bones Rack. Why Won’t the Replacement Rack Straps on the Accessory Page Work? I Am Worried That Trunk Rack Will Scratch My Car. I’ve Lost the Keys to My Saris Lock. What Do I Do? Can I Open My Trunk When the Rack Is Mounted on the Trunk? What Class Hitch Do I Need for My Hitch Rack? Comments 0 comments Please sign in to leave a comment.