Titanium Head Tube Extension — TI CYCLES FABRICATION
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
Mountain Bike Fork Extension Riser Stem Lengthen Extender 3cm Head Tube Adapter 25.4mm To 28.6mm - Bicycle Stem - AliExpress
20mm Steering Tube Extender Adapter For Straight Fork 1-1/8'' Or Taper – Dcbikes
32/39.8mm Bicycle Tapered Steerer Tube Front Fork Extension Head Tube Aluminum | eBay
Guardung Handlebar Stem Extender Bike Front Head Tube Fork extender bike stem extender Stem Height Extend Lifter - Walmart.com
Bicycle Carbon Steerer Tubes and Safety - Road Bike Rider Cycling Site