Amazon.com : CyclingDeal Bicycle Shoes Cleats Adapters - for MTB Shoes to Use with Cleats of Road Bike Pedals - Compatible with Shimano SPD-SL, Look KEO & Look Delta - Converting Adapters
SHIMANO SM-SH40 CLEAT ADAPTER FOR SPD PEDALS
Shimano SPD Cleat Adapter With Bolts - Rebec and Kroes Cycle & Sport