Just called ESPO springs...
I just got done with my rear end swap and got Espo 6 springs with stock height. I have 15s on the back and I’m kind of wishing I had gotten the +1 inch curve but was so afraid of having a giant rake. I’m very pleased with the quality. Traction is great. Ride well. Just needed some scuffing and paint and trimming of some bushings. You’ll be happy.