1997 911/993 rsr rear spring spring ID.

[randykyra]

All, I'm building a project and I have a set of Porsche 911 993 RSR Cup Car Rear Bilstein Shocks Struts Factory Original 95-98 without springs. I'm trying to figure out the original inner diameter of the springs. I've measured the seat and it comes in at 2.34 inches so I'm unsure if the 2.25 springs run big or do the 2.5s run small. Really dont want to order then reorder. Any help here?

Thanks

[Dan J]

60 mm