Stock Swaybar size on 2004 C5
#2
C5 Swaybars
23mm, front; 19.1mm, rear --- FE1/Base
25.4mm, front; 21.7mm, rear --- FE3/Z51 97-99
28.6mm, front; 23.6mm, rear --- FE3/Z51 00-04
30.0mm, front; 23.6mm, rear --- FE4/Z06
31.75mm, front; 25.4mm, rear --- Hotchkis
38.4mm, front; 27.5mm, rear --- GM T1
23mm, front; 19.1mm, rear --- FE1/Base
25.4mm, front; 21.7mm, rear --- FE3/Z51 97-99
28.6mm, front; 23.6mm, rear --- FE3/Z51 00-04
30.0mm, front; 23.6mm, rear --- FE4/Z06
31.75mm, front; 25.4mm, rear --- Hotchkis
38.4mm, front; 27.5mm, rear --- GM T1