Call of Duty Modern Warfare II - Side Job Sounds

Here is a Google Drive link with an archive, which contains four folders. Pick one and put it in your mod_overrides folder.

Since you didn't specify from which version of the game you want the sound from, here is two of them: one from original MWII and the other from 2022 remastered. Each sound also have two versions: normal and earrape.
Normal is a little bit louder than rest of the sounds, but not too much. Just to be distinguishable even during heavy gunfire. Basically, it should sound OK even if your SFX volume is set to 100%.
Earrape version is made just in case. For example, my own sound volume is currently set to 35%, so personally, I'd prefer this version. Thus, if you're also using lower volume settings, you should try it, too. Just keep in mind that at highest volume it may hurt.

There are also two .wav files. They're just for preview, to make sure which version do you prefer more.