CBR600F4 Rear Spring Diameter

Hey guys

Want to buy a CBR600F4 rear shock for my build I'm doing but I really need to know the rear spring diameter. The one I have on my bike now is 3" so if I need more clearance I'd like to know before I mount my battery box.

Anyone know or can measure? I registered on the CBR forum but they have this stupid moderation queue so who knows when I'll get on there.

Thanks!