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Hello, I'm trying to replace the brake bulb in my sister's 2018 Civic 4 door. Her manual just says 21 watts with no trade number I'd guess you call it like maybe "168" or "921" which is what I'm use to

Is there a specific number I should be looking for? I don't want to got to Honda, trying to save her a couple bucks. Thanks!

 
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I believe the brake light is 7440

 
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Usually the auto parts store will have a book/computer to tell you the bulb number. Or go to like Sylvania.com or rockauto to look it up. But I believe 7440 is correct, unless you need a dual filament bulb

 
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My 2018 hatch accepted a 7440/7443 LED just fine for the brake bulb. But yeah, I get what you mean. The user manual is all sorts of funky when it comes to what bulbs the 10thgen uses.

 
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Thanks for responding. I'm still a little lost. The bulb I pulled out thinking it's the brake light bulb doesn't match the 7440 bulb at the store. When I press the brake pedal, the bulb on the driver's side light's up but not on the passenger side. The bulb in question that works on one side and not the other looks like the picture attached.

 
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Well then. There's a difference between the sedan and the hatch of which I was unaware. I'll see if I can find a bulb guide that actually says what it's supposed to be

edit: apparently it's an 1156 (a.k.a. BA15S) bulb.