That particular part is not available to order from REI.com. However, if your local REI is offering contactless shop services, you can set up an appointment with them to get your bike serviced and parts ordered. You can find the list of stores offering this service here. If your local REI store is not offering contactless shop services at this time, you can email email@example.com and one of our bike technicians will try to get back to you as soon as they can.
Hope this helps, thanks!
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