Thanks for chiming in. I was looking at the Eaton site and it explained the two ways to re-arch a spring. One was cold setting and the other involved heating the metal and reshaping it. In theory the latter is supposed to be a better solution. Do you know what process was used on yours (cold vs. hot)?
So far I am only able to find springs with the thickness taper but not with the wide side taper. My concern is the fit at the shackle ends with the non-taper design.
Looking a Eaton's site they state "Thatís why our springs are built from the original factory blueprint
" but their mono spring doesn't have the wide side taper. I assume it would be in the blueprint! This URL shows their hot process, it's pricey though http://www.eatonsprings.com/rearching.htm