Front and rear spring size

Hi i have an 06 NC and based in Grantham. I have put Bilstein shocks on and also replaced the 16inch wheels with 17 inch ones im looking for help in choosing the right spring, i do not want lowering springs, but searches for springs , come up with options for 16 inch wheels or 17 inch wheels . any help or avice welcomed

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Also…

bryan@mx5parts.co.uk

I have changed from 16" wheels with 205R50 to 17" with 205R45. I don’t think the previous set-up was correct because the speedo overread but is now almost spot on (vs GPS). I also lowered the axle to wheelarch height by 25mm from standard springs/dampers, and clearances are still fine.

The car handles better now but it is combination of things that all tend to reduce roll, plus Michelin PS4s, plus previously 60k mile dampers.

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Personally, I think the car rides too high on the standard springs. My springs have around 35 to 40mm lowering and improve the look and handling of the car.