2 of these (5mm together)spacers will be perfect for 6 to 7 or 7 to 8 speed. This is the case usually with kids gear bikes (Islabikes, Frogs., Squish and so on).
CYSKY 31.8 Bike Stem 45mm Mountain Bike Stem Short MTB Stem Bike Handlebar Stem for Most Bicycle BMX MTB Road Bike (Green)
CYSKY 31.8 Bike Stem 45mm Mountain Bike Stem Short MTB Stem Bike Handlebar Stem for Most Bicycle BMX MTB Road Bike (Blue)
CYSKY Bike Stem 31.8mm 25.4mm MTB Stem 60/70/80/90/100/110/120/130mm 7 Degree Mountain Bike Stem Short Handlebar Stem Riser for MTB Road Bike Gravel City Bike Ebike (25.4mm Handlebar Clamp, 130mm)
CYSKY Bike Stem 31.8mm 25.4mm MTB Stem 60/70/80/90/100/110/120/130mm 7 Degree Mountain Bike Stem Short Handlebar Stem Riser for MTB Road Bike Gravel City Bike Ebike (31.8mm Handlebar Clamp, 100mm)
CYSKY Bike Stem 31.8mm 25.4mm MTB Stem 60/70/80/90/100/110/120/130mm 7 Degree Mountain Bike Stem Short Handlebar Stem Riser for MTB Road Bike Gravel City Bike Ebike (31.8mm Handlebar Clamp, 80mm)
CYSKY 31.8 Bike Stem 45mm Mountain Bike Stem Short MTB Stem Bike Handlebar Stem for Most Bicycle BMX MTB Road Bike (Red)