Infinity Rad Noserider

Hi, can anybody help me? I´m looking for a good fin for my Surftech Infinity Rad Noserider.
My board has a 5 7/8 center fin and 4 7/8 side bites, has anybody the same board??
My board has a 5 7/8 center fin and 4 7/8 side bites, has anybody the same board??