On the S/V70, the assemblies are held to the frame by 4 10mm screws. The corner light is held to the headlight by a plastic bracket, pushing down the plastic tab allows the corner light to be pushed forward and out. If you take out the headlight assembly, it comes forward.
Yes, you will have to adjust the light up or down but probably not from side to side. Adjustment is fairly easy: Find a level spot and a wall. park the car with the bumper touching the wall. Tape a 8X11 sheet of white paper to the wall in front of both headlights. Note the bright area and using a marker, draw a line across the paper at the top edge of the line. Back up about 25 feet and adjust the headlight. The bright lines should be about 1 inch below your marks. Adjust left to right to keep the light in the same position, ie, should not wander from one side to another as you back up.

If it is just the glass that was broken, then replace just the glass. The entire corner light will have to be replaced, about $25 aftermarket.

Klaus
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Volvoless. Sold the R. There is now a void...