This is a Spring Hanger made for 3" wide Full Sized Broncos and many Full Sized Ford Trucks. The Springs are 3" wide but the bushings make for an overall ID of just over 3 7/16". It has an additional "ramp" piece for greater rigidity. This particular style hanger can be used to add 1"+ WB when used extending beyond the frame, the Spring Pin location is aligned with the leading edge of the bracket itself, that can come in handy. We have used them facing front or rearward, the ramp can act as a skid too. Many people are discovering these springs as replacements for the stockers, starting to see them alot on Toyota trucks. Sold in pairs.