I'm looking to get the BDS 4.5 or Zone 5 with coilover. But is the 4.5 or 5 coilover the same as the 7in kit coilover? I don't want to have to buy a new coilover if I upgrade to the 7in. I just want 4.5 or 5 right now. Would icon that are made for the 7" kits work for the 4.5?