The cover is number 2 shown in the diagram and comes in chrome.
This item fits the following models: Triumph Liquid Cooled Bonneville T120 > AC6129, Bonneville T100 > AC5926, Bonneville T100 Black, Bonneville Bobber > AC1195, Bonneville Bobber Black, Bonneville Speedmaster > AC1200, Bonneville Speedmaster AC1201 >, Street Cup, Street Scrambler > AB9836, Street Twin > AB9714, Liquid Cooled Thruxton and Thruxton R.