The cooler is designed for use with Mocal oil cooler/remote filter systems. GENUINE MOCAL 13 ROW OIL COOLER WITH 1/2" PUSH ON FITTINGS. Mocal Part No. Matrix Width: 235mm. Exact cooler size required depends upon: The type of use, ambient temperature, spec of the engine (internal friction, rev range, power etc), airflow through the cooler and over the sump.