This is not my mod, it was on my KX125 when I bought it. I kind of like it even though I never had a rear brake oil reservoir broken...
And yes, this is a generic mod carried out on my 125 but it is applicable for all bikes. It's just that I had my air-filter out for cleaning ant thought I'll take a picture.
The guy moved the oil reservoir in to the air filter box. See picture.
