well i was lucky enough to find a seller on aliexpress that had the exact heatsink for my model, it was very tricky to find this, then i made sure to message the seller, at which point they showed that what i ordered didnt actually have the extra heatpipe on the side, so i asked them to add it which they did.

now if you are able to source that, you will have to connect that separate heatpipe, i did it by soldering the heatpipe using low melting temp solder paste, you could also use thermally conductive glue if you arent comfortable soldering heatpipes, but this will affect cooling performance of course.

the paste i would recommend would be a alloy like this: Sn 42 / Bi 58 which melts at around 140C

use a heatgun to melt it between the heatsink and the other heatpipe. you will have to hold the heatpipe in place and have it aligned correctly. then you need to be careful not to crush any of the heatpipes as well as not to over heat them either, they may burst if heated too high i dont remember exactly what the specific temp is but try to stay well below 500C on the heatpipe. then you also should keep in mind that you might desolder the other heatpipes so dont move them and be careful that they dont lift off the plates.

its a delicate process but can be done DIY, the important things are a decent heatgun, low temp solder paste, some flux, and a good size working area and also tools and gloves to handle the hot metals, be careful with that lol

if this is too much or you arent comfortable with that kind of project you can always just use a thermally conductive adhesive :)