Fastening clip

A fastening clip, comprising:

• a clip body with a pair of side walls, each of said side walls being provided with a window;
• a pair of retaining portions, wherein each retaining portion includes a part that protrude through one of the windows in a rest and use position and that is deflected during the placement of the fastening clip in its use position, each retaining portion comprising an end portion;
• and
• a head portion provided at an end of the clip body and protruding from said side walls,
• wherein each end portion comprises a bent portion, wherein each end portion is divided in two side portions by a groove, and, for each end portion, the bent portion is in one of said two side portions of the end portion, and
• wherein the fastening clip also comprises a base body having a pair of verification elements, wherein, the use position, each verification element is placed in a respective one of the grooves.