I would check the part number on the spring, and cross reference it with
all other car types. The springs might not be what you think they are,
unless you saw them properly working on a particular car.

I have boxes of new springs that the customer brought in to be installed on his car, and gave to me when they were not what he thought they were.

Most manufacturers won't even tell you the spring rates for what they sell, so that you can compare it to the OEM springs. That's one of the reasons I lower cars using OEM springs. The ride comfort doesn't suffer,
and I know how to calculate the ride height, and by using stock adjusters,
the tires don't get eaten-Bob