TBU with level 8 bull pro 16x8.8 4.5" backspacing

[bama16]

does anyone know if the tundra brake upgrade will fit these wheels without spacers? specs on wheels 16x8.5 ET-6 (4.5" BS).I've been reading post about different wheels, but there seem to be certain 16" wheels that work, and some that don't. It also appears that 4" backspacing is the magic number. 4.5" may not be enough to clear.

thanks!