Please Carefully check the Size of the Rods in Specific and Description Specification TüV Certification Con Rods Power: 600hp ~ 800hp per set Quantity: 4 Pieces a set Bolts: Including Genuine 3/8" ARP 2000 bolts (Note: Extra cost for upgrading to ARP L19 bolts) Material: Forged 4340 aircraft chrome moly quality steel for racing Weight Tolerance: Balanced to +/- 1 gram in set Application for Ford for Sierra Escort RS Cosworth YB Dimensions Center to center length: 136.5mm Big end diameter: 55mm Small end diameter: 24mm Big end width: 25.9mm Small end width: 25.9mm NOTE * Professional installation is highly recommended (Instruction Included. (If not, we could offer you the E-book version. )) * For any needs please contact us