Here is what you need for a front Nismo bumper conversion.
• Front bumper - FBM23-1A47H ($578.61)
• Front bumper diffuser - F2026-1A47A ($346.01)
• Wheel well protectors - F20641A30A, F20641A30B, F20641A30C, F20641A30D ($97.24 EA)
• (Two) Bracket-Front F20421A30A (62675) ($83.47 EA)
• (six) Rivets U0RVT1A007 (62010R) ($1 EA)
The rest of the parts you can use from your original bumper hardware
Optional: You can mod/hack your original ones to fit or get the real ones
• F3845-1A30A (Front inner wheel well liner for one side) ($54.13)
• F3844-1A30A (Other side) ($54.13)
• G5892-1A30A (Under Engine Cover) ($964.91)