Cheap heatsink from amazon, cut in half and with the right placement the cover fits on with no modifications. Ignore the ones on laptop are silverish, i have gotten out of hand with nickel plating. The one on the battery is just there for reference it's not actually attached to the battery.

https://www.amazon.com/dp/B073QKMH4S?psc=1&ref=ppx\_yo2ov\_dt\_b\_product\_details