In case anyone else runs into this issue, the parts diagrams online all said my 2004 Hilux used the same front brake pads as a '85'ish vintage 4Runner, but they don't fit. After measuring the disc, I tried the '95'ish 4Runner front pads and they fit perfectly. Not sure if this is a series 6 issue with the parts diagrams or specific to my LN166; but definitely an error (or someone updated my front brakes).