Do these exist?

I saw this flex-a-lite 5717 on Summit, but it says it has a max rated rpm of 4,000. I called and asked Flex-a-lite about it and they said they don't recommend it for my 340 because of the RPM limit. They recommend a flex fan instead. I guess my search for a 17" clutch fan is still on...

http://www.summitracing.com/parts/flx-5717