Yep asked Rally Design and they didn't know

Did a bit of measuring, The diameter of the hole in the arm is 45.9mm the diameter of the old bush sleeve is 45.9mm and the diameter of the inside of the sleeve where the old rubber sits is 43.3mm Somehow I don't think they will just slide in, not when the bush od is 49.4mm....

Time for a refund.... and time for Powerflex bushes me thinks !