OK, the denouement. I removed the old, original springs and replaced them, at least temporarily, with the correct Eaton branded springs, painted reasonably close to what they should be. I know this is a temporary situation, but it did bring the ride height to within a half an inch of equal, right to left. The left side is still a bit low, but it's clearly better than it was. I'd like to drive the car a bit more, although I put 35 miles on it before I took the measurements. Thanks again. Steve.