Best pre-painted backup sensors - form and function??

I've read through threads talking about backup sensors but curious if anyone has purchased any that are pre-painted (I have classic silver metallic 2010) that look stock when installed and work reliably. Lots of options on Amazon but most with few or no ratings and they are all around $15-20 which makes me suspicious of quality regardless of ratings. Would really like if it came with an option to adjust volume (some seem to have audible alert that is really loud but not adjustable). Thanks for any suggestions.