I bought a Flex 140 from Dell for SRV-IO GPU goodness, and it did not come with a tall bracket. Just the shorty 2U one installed on the card.
Dell support has been completely useless: “here’s the number you want to talk to sales we can’t help you”. Sales likewise: “so you want one more of those GPUs? this one doesn’t come with the bracket either, probably, we don’t know”.
It’s one of those fancy types that attaches to the heatsink from the bracket’s flat side with custom mounting holes. It’d take me a while to design and have one made, and I am REALLY not looking for another project at the moment. Plus I’d rather not drop $100+ on a custom-milled PCI bracket…
I know the tall brackets exist because Lenovo sells the cards with both.
Just posting to see if maybe someone has an extra one. Or a bright idea. Or something.
In case it helps someone:
Spending half a day 3D-scanning, parsing the PCIe electromech. spec, printing fitment prototypes: $0 (my time is literally free guys!)
Having it printed from steel in China: $8
Having it shipped to my door in 2 days: $30
Never having to talk to Dell ever again for any reason whatsoever: priceless!
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QFT
I had my Dell/OEM moment 20 years ago. Saved me from a lot of frustration in the past.
And everything that isn’t physically taller than you can fit into 2U should have both low- and high profile brackets shipped. Especially for stuff with rear IO. A thing I check for when buying my stuff these days. You never know when the 2U or SFF case is coming 
But glad you got that solved. If you can’t play with new toys because it’s THE WRONG BRACKET…depressing.
Well, Dell was the only non-ebay source for this, and I actually bought it before the price went through the roof (it’s over $3K now, for a card that’s literally only good for VDI… )
It’s really good for that one purpose though. You can slice it into VFs forever, the limiting factor is the VRAM.
(Rougher than expected on AMD CPUs, but it does work. Also it wants an older kernel. Clearly not top of mind for Intel, but still, a good product for that one thing.)