[C4UC101969]

I am new to all of this lowering kits and disc brake conversations, but do need to make a front disc brake conversion and lower it a bit as well maybe 2 inches max. on my truck that purchased back in august.
The disc brake conversion kits on ECE, when it says with 2.5" drop does that mean that kit will allow me to further drop the truck by 2.5" or this is for a dropped truck with a 2.5" drop? Do I need a separate lowering kit as well? As mentioned I am completely new to all of this and learning quiet a lot form all of you on this website.