Connecting Rod Bolt Material: ARP-L19 Alloy Steel. Rod Bolt Nut Style: 12-point. I-Beam Conrod Connecting Rods ARP 2000 for Honda K20 K20A2 K20Z1 K20Z3 5.472". Rod Bolt Head Style: E. Cylinder Piston Gasket Top End Rebuild Set For 99-08 Honda Sportrax 400 Trx400EX.