pretty sure is300 and jzx coilovers arent the same btw. I have some KTS coilovers for a jzx90 but they need new lower bushes
AFAIK JZX110 to IS200/300/Altezza should be a direct fit to the chassis (since the chassis is deemed the same) but top mounts and length could be different. JZX90 and 100 are completely different chassis so no direct fit there I reckon.
I have jzx apex n1 ones on the car at the moment just the top mounts were diffrent an now one has a leak