crf 450 caliper works, you just have to oblong one of the holes in the brake stay.
well i ordered the part #45190-men-006 and is exactly what i already have! so caliper still not even close to fitting, dont understand. now im invested over $200 into this and looks to be useless
http://www.servicehonda.com/parts/lookup#/Honda/CRF450R_A%2f%2fB_(05)_MOTORCYCLE%2c_JPN%2c_VIN%23_JH2PE053-5M350001_TO_JH2PE053-5M399999/FRONT_BRAKE_CALIPER/CRF450R-05-JPN-A%2f%2fB/2Y14MEB2MEB4F0700AD#17
Yup i sucked the head. taste like dirt.