I was beginning to wonder what happened to this.
I used the M-2300-K Kit also but it tells you that it uses 94-98 Axles and if you want to run 17x9s that the Correct Backspace to use is 6.42" and that you should roll your Fenderwell Lips.I used the Ford Motorsport cobra 5-lug kit (2300-k I believe) on my car, what kinda ticked me off is that I was told 6" offset 17x9's would work, that was not true. I had to custom order some new 17x9's with a 6 3/4" offset so I didn't have to flair the fenders. The kit will work with 17x8's fine but not standard 9"ers. The reason for this is the use of axles and parts from newer sn95 mustang which space the wheel mounting surface out 3/4". They don't tell you this in the kit anywhere so I just thought I'd throw the comment out here so people know if they go to use the kit in the future. =)
p.s. with 17x9's I fit 275 rear tires in too and only had to roll the inner lip a bit to have clearance.