can't find the right size heat sink and fan for my motor

[kadenw968]

recently bought a hobbywing ezrun combo a2 as an upgrade for my rc car https://a.co/d/6Jc49uw , and the 18T/2030 motor gets really hot so i want to buy a heat. sink and fan, but i can't find one on amazon thats the right size, does anyone know where i can get one thats the right size? the motor has a 20mm diameter.

i bought a heat sink & fan https://a.co/d/bnCZri5 before being able to measure the motor, and the opening for the motor on the heat sink is 26mm so it’s way too big for it

 

[tntpoof]

trim down heat sink. try a hose clamp for a radiator hose. a smaller pinion.