Hotchkis leaf springs sagg brand-new
The reason I think you need stock rear shackles isn't because of length. Notice Autox pic of the reliefs in the shackle that make them narrow in the middle to clear the frame rail. The shackles are as far angled as they are gonna get when sitting at static ride height. I think if you used stock front hanger and shackles you would be golden. Other than spring wrap.