ZR-1 Control Arm and Swaybar Bushings

[MIZR1]

I plan to replace the upper and lower control arm bushings and the sway bar bushings with polyurethane bushings. The chart at the link below indicates the ZR-1 has 26 mm front and rear sway bars and that the ZO7s have a 30 mm bar. My first question is whether all ZR-1s have the 26 mm front swaybar, or are some equipped with the ZO7 bar?

http://www.vettenet.org/susp_chart.html

My second question is can anyone confirm my understanding that the upper and lower control arm (front) bushings are the same dimensions on the ZR-1 as for standard C4s.

Thanks in advance for any help.