To ensure reliability, purchase GM part # 12539086 Piston Asm,(W/ Pinion)(0.020" Oversize). It is sometimes referred to as Pontiac Piston. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts. This part fits specific Pontiac Bonneville, Grand Prix models.
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