When you replace the narrower AL KO brake assemblies and drums of your 3,500 lb trailer axle with the wider size of 10 by 2-1/4 inch using the assemblies # AKEBRK-35-SA and hub/drums # AKHD-545-35-K the hub face to hub face dimension would not get affected. You wouldn't be adding any width to your axle. view full answer...