Ozzy Tyres do the same kind of deal, they use K-mac custom set springs and you can have them measured to the height you want. But again same deal, take a fews days to make up then fitting. They charge $390, they are located in liverpool, not completley sure of the address..... http://www.ozzytyres.com.au

But when chucking in some lowered springs it will get a little bumpy ( known as hte Pimp Bounce ) if yo uwant a truley smooth ride get a set of sports shocks as well

good luck

tim...