I understand they require ‘84 and up rotors and bearings. I believe there was a bearing change that used a larger spindle that year. ‘84 and down was 4 1/2” BP ‘85 and up was 5”. My concern was that they may be Dakota spindles machined for a D-150 which placed the tie rod closer to the spindle axis. I guess not many here have used these to confirm. I plan to contact X2 and will post a reply.