I love that rims and cap combo someday im gonna git me some of that.... My buddy has a 2004 2500duramax and he has those hubcaps so Id assume there just a 3/4-1ton hubcap, But don't take my word, they just look the same.
I should steal one and try it on my factory aluminum rims....
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2006 Dodge 2500 Cummins 6spd 4X4-33X12.50 Mickey thompen MTZ NASTA SS nerfbars, 3rd brake light and tail light covers chrome and SS, and 5inch SS tip BHAF mod w/AFE TT amsoil 4510 Protected by Amsoil, front and rear diffs, tranny&TC