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? What’s the recommended maintenance for 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.