These bushings are made of chromolly and are sold INDIVIDUALLY. See below for applications. The tie rod adapter bushing (TRA) is used to adapt: 1. The EB tie rod to the F-150 knuckle (tie rod under). 2. The drag link to the tie rod when going tie rod over (any combo). 3. Used with the TRO bushing when going tie rod over with the F-150. knuckles and the EB tie rod. For #1 above you will need 2 TRA bushings. For #2 above you will need 1 TRA bushing. For #3 above you will need 3 TRA and 2 TRO bushings.