These con-rods will fit the OM602 Direct Injection 2.9 L and OM603 "Rod Bender" 3.5 L with a 28 mm small end diameter. 
These forged connecting rods are capable of over 150 HP per cylinder. They are built with high quality 4340 chrome moly steel. H-beam design greatly increases strength and durability over stock rods. Magnaflux inspected. Multi-stage heat treated for increased stability. Honed to exact tolerances.
High strength 7/16" bolts are included, which should be torqued to 70 Nm. 
Each purchase is for one rod and two bolts.