How do you determine "ride height" to make suspension mods??

FYI - Coy's won't make custom 18x12 C-5 wheels either. --- as per their email:

We only produce what is posted on the web site.
http://www.coyswheel.com/coys.html

On Wed, Oct 27, 2010 at 5:56 PM, Derek Libreht <[email protected]> wrote:
Your Email Message
Name: Derek Libreht
Email: [email protected]
Message: I am interested in finding out if you can do custom sized rims in the C5's -- I am interested in getting a cost on (2) rims in 18x12 - 5 on 4.5 mopar spacing bolt patter -- color would be either chrome and black or the chrome and dark gray.
Please let me know if this can be done and what it would cost.
Thanks
Derek
Pittsburgh, PA 15212

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Coys Equipped
303-297-2697
5952 North Broadway
Denver, Co. 80216