The led light screw holes perfectly align with the reflector holes. The led wiring red is stop lamp which connects to yellow on vmax, the led black goes to blue on vmax while the white goes to ground
4" / 100mm Flush Mount Motorcycle Motorbike LED Stop / Tail Light for Streetfighte... https://www.amazon.co.uk/dp/B0117VZIR0/ref=cm_sw_r_sms_c_api_Xj4wybKQ685K0
You will need to make up some male to female bullet connectors and solder if you can . The white ground on the led has a male bullet connector so I just simply put on a earth ground eye and bolted it nearby