Best Seller | 1989-1994 Mercury Topaz Spark Plug Set - Autopart Premium Mercury Topaz Spark Plug Set. Brand: Autopart Premium. Fits Years: 1989, 1990, 1991, 1992, 1993, 1994, 89, 90, 91, 92, 93, 94. Spark Plug Set -- Gap 0.054 inch; 4x Iridium and Platinum Spark Plugs 4 Pcs Iridium & Platinum Spark Plugs for Chevrolet... ... more 1989-1994 Mercury Topaz Spark Plug Set - Autopart Premium Mercury Topaz Spark Plug Set. Brand: Autopart Premium. Fits Years: 1989, 1990, 1991, 1992, 1993, 1994, 89, 90, 91, 92, 93, 94. Spark Plug Set -- Gap 0.054 inch; 4x Iridium and Platinum Spark Plugs 4 Pcs Iridium & Platinum Spark Plugs for Chevrolet... Partsgeek.com | | $27.95 FREE shipping go to store |