Brutal honesty is good. Let me guess--you're a car salesman for Mazda. Appreciate the thought. Think of me while popping and ice cold Mich Light, too.
Dude---do yourself a favor and do it once & do it right---replace all 6 spark plugs AND the wires---I realize that this can run some bucks but you will thank yourself (and maybe me too!!) when your Mazda runs at near 100% and you also get maybe 5 miles per gallon better mil...