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

I can definitely tell you I have called, emailed, and no one will do an 18x12 -- Even custom ordered they still won't -- Bullitt Rims - NO ---- COYS -- NO

Only company I found who will do one is Billet Specialties, They make them completely custom to your backspacing in a style close to the Bullit Rims for around $750/ each -- Not too bad for an 18x12 with custom back spacing.