This Looks Exactly Like a 16548, Except the Field is 1/2" Longer, Making the Whole Unit Longer. This Length is Necessary in Order for the Vehicle's Brackets to Re-Fit Properly. The 16548 Will Work, But the Rear Brackets May Not be Able to Be Re-Attached Without Modification. There is Also a Similar Unit - 17123, Which Looks Exactly Like the 17122, But is NOT Interchangeable. For the Full Explanation, See 17123.