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. What Are Hatch Huggers? What kind of bike (type and weight) can be carried on my bike rack? How should I position my bike when mounted on my bike rack? Comments 1 comment Sort by Date Votes Morris P Flores May 02, 2019 19:23 What's the price of black replacement knobs ? 0 Permalink Please sign in to leave a comment.