does anyone have experience with stanceparts air cup kit? I'm thinking of getting this for my 03 G35 coupe, which currently rides on HKS Hipermax IV GT coilovers.
Minor problem is that I need to determine the shaft diameter of the coilover, which (afaik) requires removal of the coilover and taking off the dust boot before I can get that measurement...
this is needed for the right air cup size ...

if anyone has this measurement pls let me know, I've reached out to HKS usa and to CZP (who previously sold me the coilovers), but CZP sales support didn't have an answer for me.
of if you have any feedback on air cup kit, let me know, I'm still trying to see if it's worthwhile!