Copper grease the pads, check the shims
Does it do it if you jack it up, spin the wheel and brake lightly ? Might be easier to fathom
Sounds like the pads moving to me, are they low, check the inside pad
from the pics I've seen it looks awesome in red try right clicking the quote box and click open
http://www.automotiveaddicts.com/47841/2015-nissan-370z-nismo-review-test-drive
If you are able to I'd paint both of the handles otherwise one will definitely look different.
The reason is even if you have the exact paint match/code you will find it near on impossible to get the paint to match the old handle as they have been exposed to UV rays, weather etc for years whereas the freshly painted one won't have been.
If you are going to do this you might as well do it right first time.
Although you will never see both handles at the same time
But I couldn't do just one tbh ... OCD