Moser also sells circle track 9" floating rear ends for $879 and you specify the width. I'm currently putting the finishing touches on my 9" floater installation. The biggest hurdle has been the brakes. Specifically the brake adaptor. The issue is that floaters are typically used by circle track racers which are limited to 15" wheels and as a result most manufactures only sell 12" brake setups but they don't sell parts to install 13" or 14" brakes. All the parts can be made but it takes time. The GMR floater kit accepts 13" or 14" rotors but it sells for nearly $3000 which is way more than a machine shop will charge to machine the adaptors. I'm installing 13" brakes on the rear but I had to fabricate the weld on caliper mounts and redrill my rotor adaptors to mount 13" rotor. Park brakes are not a big issue as Speedway Motors sells a $299 pinion mount brake kit specifically for the 9".
http://www.moserengineering.com/circ...floater-9.html