OP, the earlier springs should work no issues. The later springs are a bit higher with more spring rate to improve suspension travel and compensate for the added weight of the later miata's. I just measured my 96 with stock springs, and it's a little under 14 1/2front and a bit over 15 1/4 rear. Ride height should vary depending on springs and tophat wear. I remember my car being slightly higher on the back 2 years ago.
I have tried most of the aftermarket lowering springs out there and none really works excluding (FM)...at least for me. Eibach pro kits looked promising but kind of sagged after a while, Koni sports adjustable perch can slow it down. Racingbeat springs are the worst, and will bottom out without having to drive hard. Tein S-tech is better than both, still not enough spring rate. I will be installing my FM springs next week, since my miata is no longer a commute car. I gotta say OEM springs ride nice.
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