0.060" (Although you didn't ask, do consider going with the same "heat range" plugs recommended for the 2005.)
.60
.060 thousands
1984 v65 sabre plug gap and NGK Spark PLug and heat range
The spark plug gap for a 2003 Buick LeSabre should be set at .060 inches. The best spark plug for this vehicle would be an Iridium plug.
2000 Buick century gap for spark plug 3.1l
Is there a drain plug on a 2005 Buick century
The spark plug gap setting on a 1994 Buick Century is .055 inches. A new spark plug will come preset from the factory and should not need adjusting.
The Spark Plug Gap.060 (In thousandths of an inch)
gap at .031 - .035
Written under the hood on a placard and in your owner's manual.
The spark plug gap for a 2005 Hyundai Accent, according to spark plug manufacturers, is .044" (1.11mm)
Spark plug diagram for '98 buck regal