RIDEWILL BIKE (Spare Headset/fork) Tapered Headset Cone Adapter 1.5-inch to 1 1/8 Black (Headset Spare Parts) : Amazon.co.uk: Sports & Outdoors
Bicycle tapered to straight fork tube adaptor *** straight tube 28.6 mm 1-1/ 8 to tapered 39.8mm 1-1/2 , 2 pieces a set for 12 dollars, Sports Equipment, Bicycles & Parts, Parts & Accessories on Carousell
headset - Adapter to use straight fork in tapered steerer semi-integrated? - Bicycles Stack Exchange