4 TB Hitachi drives won't fit in 2008 Mac Pro

I just purchased 2x 4 TB Hitachi drives for my 2008 (3,1) Mac Pro. When I went to install them, they would not fit. I mounted the drives to the sleds, and tried to slide them in. They would only go about 95% of the way, and I could see that the SATA connectors weren't linking up. I pushed fairly hard and couldn't get them to budge.
I turned on the computer to see if they were mounting, and they didn't.
On OWC they say the drives are compatible. Any ideas?

Desktop Hard Drive screws are an SAE (American) #6 size, 32 threads/inch. If you had a die to clean up the threads afterwards, you could file them shorter.
There is also a common electrician's wire stripper/crimper tool that has dies in the handle for those and a few other common screws used in American Elecrtrical work. You can screw a screw into that die, and squeeze the handles to lop off the end, then back it out to clean up the threads. I was surprised to find one in a drawer, and it has been very handy. Looks like this:
-- image courtesy Lowes.com
CD, DVD, and notebook Drives use a metric 3mm screw, 0.5mm/thread

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