Hey guys, getting bronze bushings and am not sure which to get. There are two types, one with a shoulder and one without. The frame is a 76' cb750 but the swingarm may have been swapped for an earlier one. The pivot bolt has the zerks on each end and I removed steel bushings without a shoulder. If I get the shouldered ones will they fit? Also, will I need a thrust washer and/or fibre washer?