torsion keys, i know for the thousandth time, just clarification

[nickbass]

I know this topic is everywhere and has been talked about alot but i just need some clarification. their hasnt been much reference to the silverado 1500hd, which i assume is the same keys and bars as the 2500? What i dont understand is the talk of ford keys and color coded keys. what keys can i buy from either ford or gm to level my truck, id say i need about 2" also would i need to but or make shock extenders. Thank you guys and sorry for the repeat again.

[nickbass]

i found i need green keys, anyone have part # i tried 15592573 on gmpartsdirect.com and it comes up as ARM and no picture is this right?