This kit comes with (3) sets of bolts.
When installing please make sure to use the replacement bolts that are (10mm) longer than the bolts you remove. This is to compensate the addition of the rack spacer.
The short (35mm) bolts are for cars using a steel cross member.
The (2) pair of longer (45mm & 55mm) bolts are for cars using an aluminum cross member.
Early aluminum cross member cars use the (45mm) replacement bolts.
Later model aluminum cross member cars use the (55mm) replacement bolts.