If you've got the money, go with Danman's suggestion, the car looks fantastic.
I have an idea which could be a poor one, but might work and if you can do the work yourself, would be cheap.
Assuming your Eibach 2.4 rear springs are 11-10-006-01-HA then they're the same spec as 159 2.4 rears 11-10-005-05-HA EXCEPT for the intentioned length, the Spider 2.4 being 304mm and the 159 2.4 315mm. Whether this would equate to an 11mm rise in the rear of the Spider if you used the 2.4 159 springs, I've absolutely no idea
maybe less, maybe more. The top mounts are the same, so for very little money, you could experiment.
GT 3.2 V6 - Q2, KONI FSD & EIBACH PROKIT, GTA REMAP, MICHELLIN PS3's, BMC CDA
159 SW 2.4JTDM TI - ALFATUNED, WIZARD BACK BOXES, KW V3 COILOVERS, NOKIAN WR A3/MICHELLIN PS3, PCA DYNAMICS ALIGNMENT.