I'd be interested to see how they work for you. Use caution though, I read somewhere on either this forum or maybe on CL that a shop installed IS350 springs on an ISF, and it bottomed out badly due to the extra weight of the V8. If the HKS coilovers really are the same for the 250/350/F, something sounds wrong to me. They are different cars, and should each have a coilover designed for the weight of their engine bay. I'm no suspension expert though...but having the same part number for the 250/350/F just sounds alarms in the back of my brain for some reason.