Shimano SPD Pedals with Removable Flat Pedal adapters - MasterCraft Cycles
ROCKBROS MTB Flat Pedal Adapter Clipless Platform Adapter Pedal for Shimano SPD | eBay
Amazon.com : EASTERN POWER Clipless Platform Pedal Adapters for Shimano Wellgo SPD Speedplay Pedals, Road Bike Dual Cleat Adapters, Black : Sports & Outdoors