They won't fit.
They're much longer top/bottom than standard indicators as shown in this old Radioguy photo.
The V8/Premium/Roewe 750 bumpers have longer holes for the indicator/fog/DRL/etc lamps
EDIT: The headlamp surrounds are designed for the Roewe which had lamps of a different size/depth. For a 75, you need the roll of draught excluder (as was supplied with the bumpers) to fill the gaps.
TC