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 - ONLY Converting Adapters :
Tutorial - How to switch from 3 holes to SPD - YouTube
3 bolt to 2 bolt SPD adapters. Convert your road cycling shoes to 2 bolt SPD - YouTube