There are after market standard sparkplugs available for most cars, i strongly advise to get an iridium sparkplugs.
The gap is .060
just get yourself NGK plugs or Denso plugs, they are the best..
Just tell the technician at the auto parts store that you have a 1999 LeSabre for which you need plugs. They'll make sure you get the right plugs. The gap should be listed in your owner's manual. They have gap gadges available for usually around the $1.00 mark.
If you're replacing the spark plugs in your car
engine, you'll need to set the gap before reseating the
spark plug. The gap is the distance electricity arcs between the ground
electrode and center electrode. The gap must be set correctly to ensure
maximum performance. Here's how to set the gap of a spark plug.
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