From Amazon
BBB Cycling 110 mm Adjustable Handlebar Stem Stainless Steel Bolts -40° - +40° Angle 31.8 mm Center Diameter 6061 T6 Aluminum HighSix OS BHS-29
Amazon
BBB Cycling Handlebar Stem HighSix OS | Ø 31,8 mm +40/-31 Degree Adjustable 110mm | E-bike Urban Cycling | Aluminium Steel | BHS-29