Do you mean the 6 cyl springs I used to use? Or the coil-over springs I changed to? Coil diameter, or wire diameter?

The V6 springs were a few years ago. Gave them away. They were out of an '89 Camaro. Don't remember any measurements.

I changed to coil-over springs with Wolf Racecraft adjustable upper spring mounts. The bottom of the springs sat right on the Moser 12 bolt lower spring mounts. Don't remember the length. Wolf can tell you what you need. Now it's back halved. Strange coil-overs. 150 lb spring.