That isn't my understanding. I was told Lexus changed sensors several times during the 460 production.I had no issues with parking sensor fit on my custom fab Victory front stealth bumper... so this is disappointing. A custom fabricated bumper shouldn't be easier to install than a OEM type product. What might seem like a small detail has added both time and money on my end. Not a great start, but that's why I was apprehensive about this job and started this thread. Issues like this shouldn't happen, as from what I understand, sensor size is universal.
I had trouble fitting them on both my Victory front and Coastal rear off-road bumpers, such that I gave up and just tied them up underneath.
I never used them anyway.