[Rick Parker]

Thanks Rick

With the shock fully extended, a 10" spring "just" fits with the threaded collar being able to be fitted. A spacer wouldn't fit or change the rate or load capacity but would just allow a different ride height adjustment.
I only have a front sway bar, it is a solid round bar that is splined on each end, it is carried in a metal tube with delrin bushings on each end. The tunability is created by using different diameter bars.

I hunted around on the internet last night for engineering sights with formulas for coil springs. All I was I was able to determine (laymans view) was that the 8" spring will compress "less" with the same load (static weight), still unable to detrmine installed height.

So let me state it another way:
How can I determine how much a given spring will compress (from free length) with a given load???

Thanks
Rick