You might not need a heatsink for that module unless you are going to run it hard, just try it and see what happens.
You can get stick on heatsinks from a lot of places, you will have to see how much room you have and order one that fits if you want/need one. I think you will just have to peel the tape of and press the heatsink down to attach it, they are really easy to use.
Google stick on heatsink and you will find lots of them, and they are cheap to buy as well.
Read the spec sheet on the 3118 chip and see what it says.
You can get stick on heatsinks from a lot of places, you will have to see how much room you have and order one that fits if you want/need one. I think you will just have to peel the tape of and press the heatsink down to attach it, they are really easy to use.
Google stick on heatsink and you will find lots of them, and they are cheap to buy as well.
Read the spec sheet on the 3118 chip and see what it says.