Depends how yoor going about it do you want to keep your ABS computer oe chnage the rear axle etc?
You can just get the rings made up to use any combination of ABS and husb etc. UCH arn't factors with the swops anyways .
Ok then use the Abs computer form the 172 for simplicity.The front and back are front the same car and have the same amount of teeth.
ABS computer? :S