Who makes a lift rear spring?

[Fifty]

I am looking for a lift rear spring. Not a level kit. An actual new spring. Some have mentioned the border patrol spring or the z71 spring. Can anyone confirm?

I have a 2015i Yukon XL Denali.


Also, does anyone know what the inner diameter of the rear spring is? I am going to put a Firestone air bag in them.

That way, even though I’m going to a 2.5” piggyback shock in the rear, I can regain the airbag assistance when I load up the kids and all their crap.

 

[87carl]

Skyjacker c25r or c50r. C25r lift 2.5 inches, c50r lift 5 inches. Says for 2000-2006 but gm used same rear suspension from 2000 till they switched to independent rear suspension in the new generation