Amazon.com: BARTON Black Watch Band Adapters compatible with all Apple Watch Models - Small Case Size (38mm or 40mm) - Fits 22mm Watch Straps - PVD Coated Stainless Steel : Cell Phones & Accessories
20mm To 20mm 22mm 22mm Watch Band Adapter Spring Bars To Quick Release Pins Band Connectors Smart Watch Strap Accessories|Watchbands| - AliExpress
Apple Watch watch strap adapters – Vintager Straps