street issue customs
www.streetissuecustoms.com
I believe doug, the owner is on SSM. The kit they are talking about is the Innovative Air Suspension kit. So larry at IAS could get it for you too.
From what I have heard it doesnt lay out, but it can be modded too.
If you want to lay out, I'd just order 4 link bars to your measurements and make a custom kit.