Mercury 4stroke 3cyl spark plugs

I really needs checking against the spark plugs you have chosen? .045" is about right for most.

1989-1996 Oldsmobile Cutlass Ciera 3.1L 3.3L V6 6 pc NGK ...

https://www.sixityauto.com > 6-pcs-ngk-v-power-spark...
This 6 pack NGK V-Power Spark Plug fits your 1996, 1995, 1994, 1993, 1992, ... 1989, Oldsmobile, Cutlass Ciera, 3.3L V6;Gap 0.060";Oe Equivalent Design ...

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  1987-1995 Oldsmobile Cutlass Ciera 2.8L 3.1L V6 6 pc Champion ...

  https://www.sixityauto.com > 6-pc-champion-copper-sp...
  6 pc Champion Copper Plus Spark Plugs for 1987-1995 Oldsmobile Cutlass Ciera 2.8L ... 1988, Oldsmobile, Cutlass Ciera, 2.8L V6;Plug Type Rs15Lyc; Gap 0.045"

What is the Spark plug gap on 95 olds cutlass Cierra? - Answers

https://www.answers.com > What_is_the_Spark_plug_g...
Aug. 4, 2007 - Standard gap is .060" or 1/16".Ask at auto parts counter when purchasing spark plugs. What is the 1972 olds cutlass 2 barrel spark plug gap ...

Go to the Champion online catalogue to find spark plug equivalents and recommended gap settings.

You either have an incomplete number for your AC spark plug or it is a very old, unusual or obsolete type because there are no equivalents for that number.

I suggest instead of trying to find an equivalent you should use the make and model number of your appliance and buy the recommended spark plug from the application catalogue of your choice. I am not fond of Champion plugs for no particular reason and prefer NGK.

The recommended plug for this motovehicle is the Autolite ASP 85. A number of Champion plugs should fit, including: RJ12YC, J12YC, J11Y, UJ12Y.

Anthony you can use any kind of spark plug brand as long as its the same size. Sometimes they have a longer sparking element and this will catch on the piston. Just be careful.

Champion 965 RZ7C is a direct replacement

Number 3 is the 3rd plug back on the passenger side. Coils are notorious for going bad, I would recommend replacing the spark plugs, while you are there. Use Auto Lite, or Motorcraft Platinum Spark plugs only.

you'll need a champion J19LM [or RJ19LM, same plug except the RJ is a resistor plug]