I’m a little late to this. I’ve been absent for the past few months with other “stuff” going on.
I see you’ve already bought you’re hardware. I don’t think you’ve installed yet, though, so maybe this info will help still.
The spring rate/length/damper question is more complex than it might seem because Lotus was always fiddling with it to make performance improvements, meet ride height regulations, and adjust oversteer/understeer characteristics. Here are a few specific model specs that might help.
Front: Rate – 22.8 N/mm / 130 Lb/in, Free Length – 369mm, Static Length – 203mm
Rear: Rate – 27.5 N/mm / 157 Lb/in, Free Length – 334mm, Static Length – 205.7mm
Front: Rate – 29.1 N/mm /166 Lb/in, Free Length – 372mm, Static Length – 219mm
Rear: Rate – 27.5 N/mm / 157 Lb/in, Free Length – 347mm, Static Length – 218mm
Front: Rate – 41 N/mm / 234 Lb/in, Free Length - N/A, Static Length – 214mm
Rear: Rate – 45 N/mm / 257 Lb/in, Free Length - N/A, Static Length – 227mm
The front damper platform height for each of these measurements is 59mm. The rear platform height is 115mm.
The extended/compressed length for the front is 12in./10in., and the rear is 16in./12in.
I hope this helps.