You have 5 bolts in the new axle flanges. 360 degrees divided by 5 =72" between studs. You should be able to redrill the axle flanges in 5 places on a smaller bolt circle, offset 36 degrees from the existing studs, remove the current studs, and press in new ones on the correct bolt circle. This is not something that should be done "at home". In order to maintain the accuracy and concentricity that you require, and the bore specification for the newly drilled/reamed stud holes the axles must be removed from the rear-end housing and taken to a machine shop, where they can be set up properly in a Bridgeport mill and redrilled. This is not cheap, nor easy, but its the only way, unless you want to go to different wheels. At a minimum, allow 2 hours time per axle flange, counting set-up and machining time. That totals out at 4 hours shop time, generally costing minimum $72 per hour. You are looking at about $290 to get this done properly.