Installation of Pedal Extenders / Knee Savers - YouTube
2Pcs Steel Bike Pedal Extenders Spacers Adapter Kit for 9/16'' Bike | eBay
Lixada Bike Pedal Extenders 2Pcs Left & Right for 9/16 inch Threaded Pedals Bike Adapters Spacers Titanium/Steel Optional : Amazon.co.uk: Sports & Outdoors