{"type":"firestarter.listing","listing":{"id":"lst_2jJ6H7i_","product_name":"Kaibab Headset Spacer Extension Kit","category":null,"description":"This extension kit will improve fit of the Kaibab Cradle on some mountain bikes, by moving the arms of the cradle 9mm to each side. It consists of four machined spacers and longer bolts for mounting the cradle to the headset spacer. It increases the distance between the cradle arms from 40mm to 58mm.\nThis kit has two uses: One is to shift the harness arms out for more cable clearance. This is very bike-dependent and hard to describe in words, but some drop bar bikes with internal routing will benefit.\nThe other use is on bikes with stems that are short (&lt;50mm) and wide (&gt;40mm). Most bikepacking bikes aren't sold with such stems, but they are becoming common in the world of trail and enduro bikes and those boundaries are sometimes blurred.\nThe clearance between the arms of the Kaibab is 40mm without the kit, which is enough for most stems, including some short 40mm stems. The extension kit increases the clearance to 58mm, which is wide enough for the popular Burgtec Enduro MK3 stem, which is the widest one we could find in our garages and local bike shops.","images":["https://cdn.shopify.com/s/files/1/0610/6529/8090/files/kaibab-spacer-extension-kit.jpg?v=1765570599"],"price":20,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:46:43.048Z"},"share_url":"https://firestarter.network/l/lst_2jJ6H7i_","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_2jJ6H7i_' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Kaibab Headset Spacer Extension Kit' and a budget_max comfortably above $20.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}