Finding the correct Axle Covers for your truck:

STAINLESS STEEL AXLE COVER 275MM PCD, 8 STUD
WE ISRT-1958-275RACSTAINLESS STEEL AXLE COVER 275MM PCD, 8 STUD
How to measure your Pitch Circle Diametre to find the correct Axle Cover:
1) Measure the distance between two opposite studs from the centre of each stud hole as shown in the diagram to the right hand side —–>
Generally the following applies for 22.5″ Wheels:
American Makes: 285mm Pitch Circle Diametre (PCD)
European/Japanese Makes: 335mm Pitch Circle Diametre (PCD)