Front section differences
1971 Horizontal lines in the grille; small plate holder under the bumper.
1972 New egg-crate grille, front bumper rubber moulding and optional front bumper guards.
1973 New front and rear treatment with new hood, fenders, grille and lights. The bumpers with shock absorbers.
1973 Front Emblem
.... and optional front bumper guards
Rear section differences
1971 Louvers on the deck lid. The taillights has horizontal and vertical lines.
1972 Rubber moulding on the rear bumper. The taillights has horizontal lines.
1973 The bumper showed just an other look and has long taillights.
Trunk Emblem
Buick Riviera Boattail