Amazon.com : Bike Stem Raiser Handlebar Extender by Delta Cycle - Increases Bar Height Up to 4.6" - Riser Adapter for Mountain Bike (MTB), Hybrid, Road Bike, with Durable Aluminum Construction :
MTB Bicycle Handlebar Bar Shim Spacer Mountain Bike Stem Reducer 25.4mm To 31.8mm Aluminum Alloy Stem Reducer Adapter Accessory|Bicycle Stem| - AliExpress
Adapter Handlebar Stem | Mountain Shim Handle Bars | Bike Parts Stem Adapter - Bike Stem - Aliexpress
KRSEC Handlebar Stem Adapter - VORO MOTORS
Bike Threadless Quill Handlebar Stem Adapter Riser Bicycle Part 22.2mm Extender | eBay
Amazon.com : LERWAY Bike Stem Riser Extender MTB Handlebar Stem Adapter with Hex Key for 1-1/8" 28.6mm Fork Aluminum Black : Bike Stems And Parts : Sports & Outdoors
Bike Quill Stem 22.2mm 25.4mm Metal Alloy Riser Extender Steerer Tube Adapter | eBay
Stem Mount - Flat Bar Adaptor - Quad Lock® USA - Official Store