How to distinguish 9c1 coil springs?
I am building a Fleetwood, and I plan to use SS springs up front and 9c1 springs in the rear. I have found a set of rear coil springs that were removed from a 9c1 with approximately 90k miles on it. Is there any way for me to know for sure that they are genuine 9c1 springs? The seller made it very clear that he does not know if the springs were original to the car, or if they had already been replaced by a previous owner.
1995 Cadillac Fleetwood Brougham BBB - Build in progress