FIG. 1 is a front view of an exterior surface configuration of an interior light fixture for a motor vehicle according to our novel design;

FIG. 2 is a side view of an exterior surface configuration of an interior light fixture for a motor vehicle according to our novel design;

FIG. 3 is an edge view from the top of an exterior surface configuration of an interior light fixture for a motor vehicle according to our novel design; and,

FIG. 4 is an edge view from the bottom of an exterior surface configuration of an interior light fixture for a motor vehicle according to our novel design.

The dash line showing depicts environment and is not part of the claimed design.