Engine block, pistons, connecting rods and crankshaft. PISTON RINGS SET STD is a high-quality piston segments no 1 part designed to fit your vehicle perfectly. Identified by OE reference 73504051, this part offers a seamless fit and dependable performance. Crafted from durable materials made for long-term use, this brand-new Original FIAT GROUP Equipment ensures your vehicle remains in peak condition and performs exactly as intended.