Replacement Soft Strap/Chest belt for Garmin Heart Rate Monitor HRM2-SS HRM3-SS | eBay
Amazon.com: Garmin 010-13118-00 HRM-Pro Plus, Premium Chest Strap Heart Rate Monitor, Captures Running Dynamics, Transmits via ANT+ and BLE : Sports & Outdoors
Garmin HRM 3-SS will connect/pair with forerunner 35 but will not show heart rate (see picture) - Accessories & Sensors - Running/Multisport - Garmin Forums