The Immersion Research Arnitel Backband Ratchet Strap found on most modern whitewater and touring boats.
If you drop a note in the comment field at checkout and remind me I will be sure to put a new metal bushing in your order.
Sold individually,
If one has broken the other may not be far behind. We recommend replacing both pieces at the same time for best performance and storing your spare(s) in your boat by cramming it under the center wall or taping it the the underside of the stern deck with gorilla tape.