This is a new correct Connecting rod bolt for both the 134L and 134F four cylinder engines. This is a 3/8″x-24 thread bolt and nut. These were used originally in the 134L motors after SN# 89737 and all the 134F motors. These were not originally used in the MB and GPW chain timed motors. PLEASE measure and compare before purchase because connecting rods do get mismatched in different motors over the years.