Just so you know, the new 124 Spider and the Abarth version are both in the C Street class for 2017. This was announced in the SCCA December Fastrack News:
#20409 2017 Fiat 124 Spider classing
Per the SAC, add the following listing to Appendix A:
124 (inc Abarth) (2017)
2013 Rosso Abarth with 48K miles, Neu-f rear sway bar, K&N air filter, autocross 17 inch Ciao Milano wheels with Bridgestone Potenza RE71R, daily wheels stock 16 inch Dunlop DZ102. 2016: 1st Place TSCC GS class; 2015: 1st place Tidewater Sports Car Club GS, 2014/13: 2nd place in SCCA South Carolina Region G Stock.
My Car blog: http://www.nms-racing.net/