Western Star

For the 3126 You Will Need: Serial and Arrangement Number which is a Combination of 6 Numbers and Letters.  The Year of the Vehicle and Type of Vehicle or Equipment.

Located:   Identification Tag on the Valve Cover.

For the 8.3L 12V & 24V You Will Need:   8-Digit Family Number

Located:   Identification Tag on the Valve Cover.

For the 5.9L & 6.7L You Will Need:   8-Digit Family Number

Located:   Identification Tag on the Valve Cover.