Method of making a vehicle light comprising the steps of: - preparing a container body for the light, the container body being shaped so as to define at least one housing chamber for at least one light source, - said container body being made in plastic material by moulding, - wherein following the moulding the container body comprises at least one attachment/centring portion provided with a pre-hole destined to house an attachment/centring means for the light, said pre-hole having an initial pre-hole diameter and having an access end, - the pre-hole being defined by an inner lateral wall substantially cylindrical to a pre-hole axis (X-X), the method comprising the steps of: - making at least one groove or recess in relation to said inner lateral wall, the groove being radially directed from the side opposite said pre-hole axis (X-X) so as to define a groove base diameter, said groove base diameter, being measured in relation to said pre-hole axis (X-X), - widening said pre-hole by means of a widening tool inserted in said pre-hole from the side of the access end, said widening tool having a tool diameter greater than the initial diameter of the pre-hole, wherein the widening tool makes a final hole defined by a final hole axis (Y-Y) and by a final hole diameter equal to the tool diameter, the tool diameter being predefined depending on the respective attachment/centring means to be inserted in the final hole, - wherein the groove base diameter is made so as to be greater or equal to the tool diameter, - the method further comprising the step of inserting and fixing in said final hole said attachment/centring means. - preparing a container body for the light, the container body being shaped so as to define at least one housing chamber for at least one light source, - said container body being made in plastic material by moulding, - wherein following the moulding the container body comprises at least one attachment/centring portion provided with a pre-hole destined to house an attachment/centring means for the light, said pre-hole having an initial pre-hole diameter and having an access end, - the pre-hole being defined by an inner lateral wall substantially cylindrical to a pre-hole axis (X-X), the method comprising the steps of: - making at least one groove or recess in relation to said inner lateral wall, the groove being radially directed from the side opposite said pre-hole axis (X-X) so as to define a groove base diameter, said groove base diameter, being measured in relation to said pre-hole axis (X-X), - widening said pre-hole by means of a widening tool inserted in said pre-hole from the side of the access end, said widening tool having a tool diameter greater than the initial diameter of the pre-hole, wherein the widening tool makes a final hole defined by a final hole axis (Y-Y) and by a final hole diameter equal to the tool diameter, the tool diameter being predefined depending on the respective attachment/centring means to be inserted in the final hole, - wherein the groove base diameter is made so as to be greater or equal to the tool diameter, - the method further comprising the step of inserting and fixing in said final hole said attachment/centring means. - making at least one groove or recess in relation to said inner lateral wall, the groove being radially directed from the side opposite said pre-hole axis (X-X) so as to define a groove base diameter, said groove base diameter, being measured in relation to said pre-hole axis (X-X), - widening said pre-hole by means of a widening tool inserted in said pre-hole from the side of the access end, said widening tool having a tool diameter greater than the initial diameter of the pre-hole, wherein the widening tool makes a final hole defined by a final hole axis (Y-Y) and by a final hole diameter equal to the tool diameter, the tool diameter being predefined depending on the respective attachment/centring means to be inserted in the final hole, - wherein the groove base diameter is made so as to be greater or equal to the tool diameter, - the method further comprising the step of inserting and fixing in said final hole said attachment/centring means.