Lotus upgraded the upright bolts on the Elise S2 / Exige S2 to high tensile (10.9) bolts some time ago.

Main reason for this change is they had quite a few reports of cars where exactly these bolts turned out to be bend or even broken over time.

This kit is a complete replacement for the upright bolt in High Tensile (10.0) Zinc Plated.

Certainly when doing trackdays or even racing the car, we would recommend to replace these bolts every year.
Better be safe than sorry.. if these break, you'll experience a very special steering behaviour :)