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
How to extend a steertube for a bicycle fork - YouTube
Titanium Head Tube Extension — TI CYCLES FABRICATION
steerer - Are stem height extenders safe to use? - Bicycles Stack Exchange
20mm Steering Tube Extender Adapter For Straight Fork 1-1/8'' Or Taper – Dcbikes
Giant Threadless 1-1/8-inch Steerer Extender - Berkeley Cycle Works
Mountain Bike Fork Extension Riser Stem Lengthen Extender 3cm Head Tube Adapter 25.4mm To 28.6mm - Bicycle Stem - AliExpress
RISK Bike Fork Steerer Crown Race System Installation Tool Extension for 1-1/8 Inch Fork 1-1/4 Inch 1-1/2 Inch Tapered Fork - Walmart.com