Amazon.com : TRIWONDER Stem 25.4 31.8 90mm 110mm 130mm 60 Degree Adjustable Bike Stem Mountain Bike Stem Short Handlebar Stem Riser for Bicycle, Road Bike, MTB, BMX, Cycling (25.4 x 110mm) : Sports & Outdoors
Amazon.com : CYSKY Bike Stem 10 Degree 31.8 70mm MTB Short Stem Mountain Bike Handlebar Stem Riser for Most Bicycle, Road Bike, MTB, BMX, Cycling : Sports & Outdoors
Buyers Guide to Mountain Bike Stems - Merlin Cycles Blog