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Manufacturers - Spring & Damper rates - autumnboy

A couple of friends have asked if they could stiffen up their suspension a little.

Apart from renewing the dampers to get a fresh set. Some want increase the spring rate for heavier loads, such as carrying things in an estate or towing a caravan and others to get a sports ride, where as an example a Suzuki Swift Sport is tighter than the Std. Swift. This is because they can't afford the sports etc.

But not wanting to reduce the ride heights as the kits you can get -40mm or 60mm etc.

Anyone know where you could get the spring and damper rates the manufacturers use as a starting point.