71 3/4 ton rear leaf replacement

[Big-Blue]

I am planning on a shackle flip so I removed the existing rear springs. It was a Minnesota truck and along with a little sagging, they have some substantial rust pitting. Does anyone know if there is a late model GM 3/4 ton that has springs that will work? Mine are the 52" version. I want to keep the 3/4 capacity and I haven't found anyone that makes an "off the shelf" 3/4 ton version.

I am guessing I could get them cheaper in a salvage yard than a custom set and with the shackle flip, seems like I could move the shackle connection rather easily along the frame if I needed a little length or if I needed to shorten.

Any thoughts? Am I over-simplifying?