You're buying TWO(2) New Autolite XST3926(DP) Extreme Start Iridium Spark Plugs that may fit your equipment depending on application.

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PRODUCT SPECS

Thread Size14mm X 1.25
Reach3/4"
Hex Size5/8" (16mm)
Seat TypeGasket
Tip ConfigurationMid Projection
ResistorResistor
Special Feature(s)Finewire
Gap.044"/1.1mm
Heat Range Chart Row22
Metal TypeIridium
Terminal TypeSolid

COMPETITOR NAME
COMPETITOR PART#
ACCEL786
AC-DELCO41-603
AC-DELCO41-607
AC-DELCO41-627
AC-DELCO41-628
AC-DELCOFR3LSJ
AC-DELCOFR4LSJ
AC-DELCOFR5LS
ATLASC17R
ATLASC19R
BOSCHFR10DC 
BOSCHFR10DCX+
BOSCHFR10DCX 
BOSCHFR8KTC
BRIGGS & STRATTON496018
BRIGGS & STRATTON496018S
CHAMPION SPARK PLUG431
CHAMPION SPARK PLUG431-1
CHAMPION SPARK PLUGRC14YC
CHAMPION SPARK PLUGRC14YC4
CHAMPION SPARK PLUGXC92YC
DELPHI33521
DENSOQ14R-U11
DENSOQ16PR-U11
FORD8U2J12405BGA
GENERAL MOTORS21020184
GENERAL MOTORS21020186
GENERAL MOTORS25177454
GENERAL MOTORS25177455
GENERAL MOTORS5614106
GENERAL MOTORS5614241
GENERAL MOTORS5614245
GENERAL MOTORS5614286
MIGHTYGRP52
MOPARSP00RC14YC
MOTORCRAFTAGSP52
MOTORCRAFTAGSP52C
MOTORCRAFTAGSP62C
MOTORCRAFTSP424
MOTORCRAFTSP624
NGKBCP4ES-11
NGKBKR4E
NGKBKR4E-11
NGKBKR4ESA-11
NGKBKR5ES
NGKFR4

COMPETITOR NAME
COMPETITOR PART#
AC-DELCOFR5LS
MOTORCRAFTAGSP52C
MOTORCRAFTSP424
NGKBKR5EIX