The bracket (one per fender) is intended tot act as a support for the fender and to reduce strain as the fender tries to pull away from the body (gravity, bumpy roads, someone sitting/leaning etc). The front half of the fender gets some support from the RB and it's brackets, so in theory, the fender bracket should go as far rearward as possible to provide extra support there, likely a couple of bolts past the top center bolt. With the easy use these cars get these days, the bracket is not likely needed at all except for judging. The curved part goes up and tight to and matches profile of curve on fender.