I answered this in your other post, but to recap. I bought Scott Drake(?) Grab-a-Track 4.5 leaf and they were way too high for my liking. I had them de-arched, but unfortunately the worker at the shop over did it and took too much out. After that, the springs started bending backwards, so likely a combination of over de-arching them and maybe crappy steel. That's why I went back to Eaton.
Eaton can custom make just about anything you want if you want to wait and pay for it.
You get what you pay for.
If you want an alternative, Rock Auto sell Dayton springs and have a performance spring at 153 lb spring rate. I have no idea about their quality, but they are a huge spring manufacturer, mainly truck springs, but they also make for other brands. Do they make for S/D, I could not find that out, so who knows.