Best ifs kit? rms, hdk, gt suspension, or magnum force?

Spun Bearing said

I called Denny this morning to clarify the track width measurement criteria. He said that the HDK's 58" "hub-to-hub" measurement is at ride height (not control arms drooped) from the outside of the wheel mounting surface after the rotors are installed - Not from the spindle hub surface.

If you don't have the rotors on yet, then the measurement is being made from the wrong place. Does anybody have a good measurement from the GST or any of the other brands that has been taken in this fashion? Please let us know what it is.

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I understand this. When I set mine, because I didn't have the rotors or the wheels and tires I'm going to run, I simply used some jacks, made the lower control arms level(i used a laser level to verify they were level btw), bolted on a pair of Mustang II hubs I had laying around from a previous project that used a 2 piece hub/rotor and took a measurement with a tap measure from the front face of the hub to front face of the hub, which is where the rim mounts.

This why I brought up the point about the hubs adding to the width. Because I would think it would depend ultimately on the hub used to get the right width.

Not only that, but most coil overs are adjustable as far as ride height at least an inch or so in either direction. Adjusting the ride height is going to change the angle of the LCAs slightly to some degree, thus slightly moving the angle of the hub up or down which, if I'm not mistaken, would alter the distance between the 2 hub faces, would it not?