i have a eclipse rear axle for mine., not sure if im gonna use it or make new irs from scratch. the eclipse is 5x114.5 and its easy to swap a accord to 5x114.5 not sure what kinda car you have but you might also have to narrow it too
Try a trailer axle or weld some tubing between your trailing arms and cut the ends off so you still have all your factory rear brakes. Also make a tube one with a flange to mount your rear brakes onto. They just bolt onto the trailing arm from the back side with a couple torx bolts I think.