standard ride height for My04 LibGT Sedan

[541NTT]

as the title reads anyone know what the measurements are? and is it from center of wheel hub to wheel arch or how do they measure it?

reason i ask is i have some lowerred springs in my gt but want to go a tad lower without going to coilovers, so im getting Kmac to make me some springs and they need to know how much of a drop i want from standard