I have purchased the same ones. I painted the wires white, but wasn't sure if I could paint the sensors themselves, so left them as they were - black. For the paint I just used glacier white spray from Halfords. This seems to match quite well with my Sandero white body paint. I think with the sensor I bought there were two options either stick on or drilled into the bodywork. Didn't want to make holes in the body work so opted for the stick on ones.
Let me know if you go for painting the sensors and if they still work.
The sensors work fine for me and does the job well.
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